Bruh... you're either trolling or missing your own point: At every level you just named there was a harbinger of doom for rap music.
Eminem was a clown ass whiteboy until he was one of the best rhymers in history. Young Cheesy (DMX reference) I mean Young Jeezy was the end of good rap until low and behold he wasn't. Nelly was pop and couldn't rap really. Lil Jon was a lame that didn't rap and just screamed. Big Sean couldn't rap buuuut actually... dope. Rick Ross was fake and the end of the real. Now he's heralded as a business genius. Kanye had hot beats but couldn't rap, but then he could. Drake was an actor and fake and sang but actually dope on the mic too. Cole would never do better than his mixtapes until he did. Kendrick was slept on until he wasn't. 21 was a trash ass mumble rapper until you realized he said his words clear as fuck. Now you're mentioning him with esteem. Tyler was called a cornball homo in the beginning, but *gasp* he evolved beyond the antics into arguably the most slept on greats from that early 10s class with Cole and Kendrick.
The point is you're demanding we tell you the future. I gave you several "nobody ass niggas" that you wrote off who could fill the void given time... the exact same way everybody up there with few exceptions was wrote off as trash ass rappers did, but because you don't see it that means there's no hope. Besides fucking Nas, Wu-Tang, Biggie, and Pac who on your list came out with SUPER respect and rap love without being written off first? Meth even said Melle Mel and them niggas hated Wu-Tang, so not even they had it all the way love.
So nah. I ain't buying this "Hip Hop and Rap are dead and will devolve away." Niggas are trash in the beginning with few exceptions. It's called learning the ropes. The art doesn't die because dudes got their foot in with one hot single and took a minute to find their footings. You sound like you outgrew this shit or need to put your Spotify on random and dig in the virtual crates. The real is out here beyond what labels are talking about.
I got multiple points
it’s cool man you’ll see
The fact that you said I need to dig in the crates let’s me know you’re missing the point funny enough
I’m not saying real Hiphop artists aren’t around or accessible but anybody you have to dig to look for isn’t strong enough to stop things from shifting to what it’s going to be
Nobody you mentioned will be at the forefront