The Music World.. where would it be today

I was listening to some FooFighters the other day and it began to make me think. Where would the music world be today if so many of the greats of different eras had not met an early demise. Lennon, Joplin, Hendrix, Cobain, etc... So many to name. I am a huge fan of the FooFighters and would they even exsist today if Nirvana wasnt forced to break up after the untimely passing of their lead. Dave Grohl might still be just a drummer in NIrvana. Also would certain passing stars music be looked at the same if they hadnt passed. Joplin and Hendrix are even more loved today than when they were alive. Its like the old saying somehow goes.. an artist or painter is not really famous until they die. Would the Beetles have had a reunion tour (I hope not).
Just some random thoughts on some music... what do you think?