Are there people who don't have .NET 3.5 installed?

...Are there people who don't have the latest versions of .NET (3.5, 4.0, 4.5) installed?...

Yes, there are, and they are doing perfectly fine without framework 3.5. I haven't needed anything beyond framework 2.0. I've installed higher versions a couple of times, but then I uninstalled them because they weren't needed. The utilities that I installed them for turned out to be useless and unnecessary. So, draw your own conclusions... However, I'm not a programmer.