Would God allow all of humanity to be celibate? God created the world with a process that involves sexuality to bring more people to existence to serve him. It doesn’t seem sustainable; if everyone achieved the degree of spirituality that the continent clergy has, then the population would decrease and no more people would serve God. 

Why would God benefit from the prohibition of an act which gives existence to other humans that will potentially also serve Him?

I read the argument “better focus to serve God by ignoring sexual impulses and distractions,” but in that case having children while controlling sexual impulses and abstaining from time to time makes more sense.
Would God allow all of humanity to be celibate?

The short answer is no.

This goes directly against what God said to Adam:


  28 And God blessed them, and God said unto them, Be fruitful, and multiply, and replenish the earth, and subdue it: and have dominion over the fish of the sea, and over the fowl of the air, and over every living thing that moveth upon the earth. - Genesis 1:28


God would not allow humanity to disappear by such an act to transpire.

Besides man has free will and as such it would be extremely doubtful that every man, woman and child would voluntarily remain celibate for life. 


  The Catechism of the Roman Catholic Church asserts that "Freedom is the power, rooted in reason and will". It goes on to say that "God created man a rational being, conferring on him the dignity of a person who can initiate and control his own actions. God willed that man should be 'left in the hand of his own counsel,' so that he might of his own accord seek his Creator and freely attain his full and blessed perfection by cleaving to him."" The section concludes with the role that grace plays, "By the working of grace the Holy Spirit educates us in spiritual freedom in order to make us free collaborators in his work in the Church and in the world." - Free will in theology