Yeah, I like that point and hope its true (re: Toni and FAA).
Also, I was wrong about Diego being his first top 10 scalp. That would be Tsitsipas twice back in 2019, when Stefanos was ranked #10 and #7.
As far as the meteor analogy, which I like, I agree that I don't see one among the current crop, but it is only a matter of time before another comes by. Going back through tennis history, as far as meteoric talents, you have Gonzales in the 50s, Laver in the 60s and early 70s, Borg in the late 70s to early 80s, Sampras in the 90s, Federer, Nadal and Djokovic in the 00s and 10s...so there's been at least one in every decade. And more if you count guys like McEnroe who were meteoric for shorter periods of time.
But the problem may be with the idea of looking for "next Roger" (or Rafa or Novak). They are, as a group and individuals, singular in tennis history. I'm a baseball and Angels fan and they currently have the best player in the game, Mike Trout. The problem is that every prospect inevitably gets compared to Trout, so everyone falls short. So rather than looking for the next Roger-Rafa-Novak, maybe we should be looking for the next Edberg-Becker-Agassi.