I suppose there is a lot of windows and C++ black magic going on under the good in VS, but since all the editing and compiling tools are all managed in VS 2015 (The OSS "Roslyn" tools are used for compiler, syntax highlighter, refactoring etc.) and those bits are free for anyone to use, it
should be quite possible for the community to make an IDE for Linux/MacOS that feels a lot like VS does on windows (Maybe the SharpDevelop team will take on Roslyn? Haven't heard).
Of course VS is a huge beast of an application and there are thousands of parts that will be more or less impossible to port straight over because of ties with windows (Profiler for example).