yorolpalNo question, that due to a host of factors many of the "superstars of the original rock period" are still around and still revered. And some can still pack stadiums. But those are the exceptions to the rule
More than that ... there are bands that are selling far more today than they did in the 70's, and the whole Krautrock and the rest of the European scene is a perfect example. The London/US factory would not sell more now because they did then, so to speak ... but there are a lot of people that are just getting it on with some of these things, and the lesser known things have more to gain, than the well known ones ...
Can, Amon Duul 2, Faust, Popol Vuh, Guru Guru, PFM, Banco, Ange and many other bands ... because the work they did was phenomenal and did not get a wider listen in those days like it can today ... but in the end, the "wider" listen to many of these well known names ... is left to a song showing up in a movie. Ohhh ... sorry ... one of us here mentioning it!
Speaking of what they would be doing now ...
Guitarist Michael Karoli, would be writing symphonies for electric guitar ... and I think this would scare the living wits out of the Coffee House, because ... ohh wow ... serious music? And I bet the Red Hot Chili Peppers would do a rendition of "Mother Sky" one more time for him!