pepe1991 wrote:Once Curry, Kawhi, Lebron, Durant retire, in soon future, and Jokić, Giannis & AD ages, league will have such a massive drop in pure quality.
When you see lists of top players, as soon as you pass top 30 you are entering role players list. 
Older established players retiring and players aging out of their prime is normal, though, as is reaching ‘role player’ territory after you made it past a few dozen players (though I don't actually think you're talking about role players once you're past the first 30 names – that definitely feels like hyperbole). There is still a lot of talent in the pipeline that will emerge as stars and superstars. 
SGA has already made the leap to (on-court) superstar and is only now in his prime. Victor is bound to make that leap, too, and already transcends the sport. Luka has been a household name and superstar for quite some time already and should only now approach his peak. Tatum, if he can fully recover, should only now enter his peak years, too. Edwards has been steadily improving and has a ton of eye balls on him. Haliburton, Brunson and Cunningham have turned into strong leaders of their up-and-coming teams. There's a crop of talented bigs out there with Sengün, Mobley, Holmgren, Banchero and potentially some others. Zion and LaMelo have the talent and the fame, now it's on them to stay healthy and play winning basketball – and if they do (big if, of course), they could still turn into superstars. Amen and Flagg have a similar appeal to a broad audience as well as the talent to potentially get there, and the next draft has two or three players with a lot of hype around them, too. 
And all of that is with at least Giannis and Jokic being quite a few years away from leaving the scene anytime soon (if they age reasonably well). I agree that with LeBron, Curry, Durant in addition to Harden, Kawhi and Paul, the NBA is bound to lose an unusually large number of ATGs, whose names are known well beyond basketball circles, in the next two or three years. No doubt that is going to hurt and it remains to be seen whether the next generation can fill these big shoes. But the NBA is still in great shape talent-wise, and I believe the feeling that the quality is about to drop has more to do with nostalgia and the legacy that older superstars were able to build over many years than actual on-court performance. I'm pretty sure when Duncan, Garnett, Kobe and Co. were in their twilight years, people have said similar things about the NBA's decline – and then other players emerged and took over the mantle. It just takes some time before they reach that status, and then the cycle repeats itself.