@Sammy8028, I don’t think it’s a case of moving the line. It has always been of benefit if actors have musical skills and can play one or more instruments. This is nothing new. And it isn’t just MT students who will have these skills. My D who graduated ten years ago and was in Atlantic studio at Tisch, played several instruments as did many of her classmates.
One other aspect of this discussion is that having these skills and abilities will be beneficial not only for shows that require the actors to play instruments but probably even more so for work/gigs/benefits/cabarets outside of actual plays and musicals. Many of the most successful, and constantly working, actors I know are also skilled musicians.
And I have to say that I can’t imagine someone who is planning a career in MT not knowing how to read music.