No, what let down the entire genre were jokes like Limp Bizkit which exposed the entire enterprise to ridicule as a pathetic melding of all the most immature and asinine aspects of both genres. This of course would be exactly the attraction to a "rap core" fan, but it turned the genre, such as it was, into something like professional wrestling set to music (hey, maybe Slim could have been a fan
) to the bulk of the music buying public. Which is to say a mockery. And of course it got old. Subgenres come and go. Once they lose their freshness, the fad moves on and they meld back in to the melting pot that is rock.
Now Linkin Park..they are something else. Any talk of Linkin Park "selling out" is rather hilarious, since they were and always will be a pop band, might have had 2 or 3 songs tops that could even sniff of being called of "rap core" and at best have been mainstream rap rock, if not actually creating a genre called rap pop. I'm pretty sure there is a rule out there somewhere that no band can attach "core" to its desription which relies heavily on a keyboard player for its melodies. Kinda hard to sell out when you come out of the womb dominating Top 40 stations and getting played at high school dances. Its like accusing Blink 182 of selling out and ruining punk.
And as I mentioned before, compare the song I selected there to the biggest hit off their first album (not mentioned just due to the nature of the thread). Tell me which one has more of an edge. Its not even close really.