I mean, I think a lot of it is also personal interest, but in terms of just generational turn-over, then yeah, sure. It's just the normal cycle of things, same as music and film. These days film schools students reference Citizen Kane without having even watched it, and the entire hipster cultural movement is built on second-hand knowledge and second-hand appreciation of ye olde things.
I grew up reading golden age scifi since that was all my library had, and now basically own all of Asimov, Clarke, Heinlein, Herbert, and Bradbury. But I only have a passing awareness of sci-fi before then, and actually am completely useless when it comes to contemporary sci-fi. I've only ever read one Iain M. Banks novel, and it took me over a year to finish Reynold's Revelation Space, never read Kim Stanley Robinson or Dan Simmons etc.
But said mates, they read contemporary stuff, and when I loaned The Caves of Steel to one of them hoping to springboard him into reading the whole Robots saga, he said it was boring and dated and that the murder mystery wasn't captivating.
Then again, when I last tried to read Huxley I gave up because the language just didn't pull me in.
Of course, it's just semantics to get into what's obscure and what's not, but I think some of the old timers on this forum would be surprised as how many of us 'youngins' are completely unaware of basically the founding fathers of modern hard science-fiction, (and space opera when you count in Dune but I actually prefer Herbert's non-Dune books).