Seems like rap is really going downhill lately

Music change all the time and the same goes for rap.
There will always be people that don't understand new genres and so on but think about it this way; When everyone listened to Mozart and all the other artists in his genre and a new music genre or era appeared then people disliked that at first aswell however after a while people started listening to that genre aswell. The same goes for every single type of music genre, it developes and sometimes into something that the majority of people dislike.

On a side note though, there's still some good lyrical artists that pops up once in a while or atleast some who doesn't do all the "trap" & "sad" rap genre. IDK is one of them, try listen to him if you got the time.