silverfish
got perma'd
Another factor to consider is how the comedy landscape has changed from the 80's and 90's. SNL isn't the only major way for a comedian to break through anymore. The Daily Show with Jon Stewart I would argue produced for successful stars post 2005 than SNL.
This is a huge piece that gets ignored or goes unnoticed.
With the (not so recent anymore) recent rise in cable/streaming, there are tons of shows that come out every year, so SNL doesn't need to launch careers.
Donald Glover would've been great for SNL, but he was able to start on 30 Rock.
The girls in Broad City would be great for SNL, but they already have their own show.
Aziz would've been great on SNL, did the stand up without it, then parks and rec.
You could do this for days.