>

Yeah that’s if the current generation at the time that would happen, wouldn’t have revolted against the government for taking it too far. Like if things get bad enough for genocide I’m pretty sure that there will be a revolt either due to the need for genocide or the act of suggesting they commit it
It doesn't seem very likely.  Ethnic diversity is not enough for genocide.  You also have to have serious economic amd political issues.  It's more likely that in the generation or two required for that level of immigration, immigrants acquire significant financial and political influence. >

Tbh reading your post makes you seem like a far right "great replacement" nut job...
It would entirely depend on how the governments of these countries are dealing with the refugees. If the immigrate then stagnate in low income/subsidised work for years, being isolated in migrant neighbourhoods and communities, then maybe. Low income means now power or influence, isolation means no real presence, easy for you to be made a scapegoat. 
If the Govts are integrating these people into the workforce and community, allowing them and their children real access to education. If the people are welcomed into local community councils, groups, sports clubs etc, and people get face to face exposure. Then it makes it hard to other someone you have a connection with.
Normalising ethic practices and habits helps too. If Ahmed has to go pray 4 times a day and nobody knows what it's about, OG folk are going to bitch about it in their cirgarette breaks. Etc >

The latter phenomenon has been playing out in the United States to an extent. 
Racial minorities moving into suburban communities has helped shift the white populations in those suburbs towards more socially progressive attitudes. >

In America, conservative, traditionalist muslims are doctors, engineers, and very successful businessmen. In Europe, you dont see as many because of the blatant anti muslim discrimination. >

TBF a lot of those Muslim Americans came from well-to-do backgrounds. They came into the country not as impoverished but with a white collar skill set. >

i doubt it. A mass expulsion would likely happen before a civil or genocidal war. >

Mass expulsion is a form of genocide. >

don't weaken the word genocide.  Genocide is killing. Expulsion is not the same, >

That's not how genocide works. 
Also, every time a place accepts immigrants, their culture isn't replaced by the immigrants. The immigrants tend to lose most of their culture and adopt the new environment after one generation. 
The culture of these countries will change by adopting the most superficial aspects of the immigrants culture such as food and some holidays. It's all additive not replacing.
The British have been letting Indians into England for over a hundred years, yet Britain isn't indonized, they have Indian restaurants and some neighborhoods celebrating Diwali, but that's largely it.
Europe won't be losing culture just gaining new cooking recipes. Your culture has nothing to do with how you look. >

I certainly hope not, and I genuinely doubt it, but the rapid rise of the far right in recent years (in places the world over, from the USA to Brazil to Italy to India) has left me far more hesitant about mankind's immunity from such movements in the future. >

That’s what I’m most afraid of. Islamic immigrants are the perfect group for the far-right to throw under the bus and come to power in Europe. I mean, with the way Italy, the UK, France, Denmark, and Sweden are currently, I could see some unrest coming quite soon. >

No European government except Albania and Kosovo will ever allow their country's population to get any close to being 40% Muslims. If you have been paying attention to what European governments have been saying about race and immigration in the last couple of years, then you will quickly realize that they DO NOT want non-white immigrants/refugees/asylum seekers entering their countries. For the UK, this applies to Albanians as well.
The Europeans are at a stage where they would rather fund offshore gulags and criminalize humanitarianism. In Europe, the mainstream center-left political parties are no longer different from their right-wing counterparts of these issues including the Labour Party (UK), the Socialist Workers' Party (Spain), and the Social Democrats (Denmark).
They are never going to tolerate the existence of parallel societies in their countries. And guess what, all those lip service for Western values and human rights have been nothing but a total sham. A few million non-white migrants and voila their true colors are revealed. And no, bringing up the history of colonialism and its negative effects or accusing people of racism, fascism, and xenophobia are not going to make most Europeans feel differently about this.
Before any genocide happens, live ammos will fly against incoming non-white migrants first and any non-white people in Europe will get the ghetto treatment. >

In America; if trumpism is not firmly defeated, then is 50 or 100 years we could get to that point. 
The other commenters who make it sound so unlikely have forgotten or are unaware of how many genocides have taken place SINCE WW2. >


if trumpism is not firmly defeated, then is 50 or 100 years we could get to that point. 

Much sooner with population increase and global warming causing climate change catastrophes. 
However,  Trumpism in international negotiations screwed over the world.  He sold out the US to the largest bidder and created isolationism for policy in horrible ways.