Have LDS missionaries stopped preaching door-to-door? Some time ago I read an article such as this one (dated June 25th, 2013), that says that:


  Leaders of The Church of Jesus Christ of Latter-day Saints announced Sunday that missionaries won’t be going door-to-door to evangelize and will instead use the Internet to probe potential new members.


However I recently watched an episode of "Inside Man" (the documentary series) where Morgan Spurlock joined two Mormon missionaries on door-to-door activity. According to this article and information here at IMDb, the particular episode originally aired in May 2014.

Understandably even though the episode aired in May 2014, it was probably taped months earlier. So perhaps the June 2013 decision had not yet been fully implemented.

Or maybe the decision to stop going door-to-door was intended to affect a particular group of missionaries(?)

Anyway so the question I wanted to ask is:
Are Mormon's really planning to discontinue all door-to-door preaching work, or have they perhaps already done so?
The LDS Church has a manual called "Preach My Gospel" that serves as a guidebook for missionary work. It is mostly directed at full-time missionaries, although non-missionaries use it for study or reference as well. As of today, in the ninth chapter, titled "How Do I Find People to Teach?", under the section on "Finding through Your Own Efforts", it provides a list of acceptable activities, which includes the following:


  Go from home to home or talk to people on the streets.


Until that changes, the LDS Church will not be discontinuing all door-to-door preaching work.

It is actually a common misconception that most LDS missionary work is done through door-to-door proselytizing. If you look at some of the other suggestions in the aforementioned chapter of Preach My Gospel, you'll see that it is only one of many suggested ways of finding people to teach. The articles that you cite are referring to the fact that, since 2013, the church has been experimenting with using online proselytizing tools in addition to other methods of finding people to teach.