it will be needed if you want update / build Bdj part of libbluray, but for MP itself not needed ( 99% of people)Good if Java, Ant, etc install not needed anymore.
libbluray must stay as is, because BDreader use files from him.What about submodule update for libbluray ? (init, sync, update)
i don't know if we always use 7.1. need to be investigate.What abbout Windows SDK (wich is 8.1, not 7.1 like wiki says).
Yasm is not deprecated, needed but maybe need to done section on wikiSome proposal : remove all VS2013, all depreciated (YASM,...) it will be more clear.
My VS2015 give me V14 folder, not V12.