I don't think anybody thinks boxing lacks talent, but the point Rogan was trying to get across was that after the current group of stars retires (and Oscar already has), boxing has failed to create new stars to take their place. And he's right. None of those guys you listed can draw on PPV....shit, guys like Williams, Dawson, Berto can't even draw on cable.
I'm speaking from a North American point of view, btw. Klitchko is about to draw 50k in Europe, and sold 15,000 tickets before an opponent was even named.
Berto should be able to draw, he should just play the Haiti card like the Saints have Katrina fans. I understand what you mean, but don't UFC PPVs draw a fraction of current boxing PPVs?
Williams should be able to draw PPVs but when someone like Cintron dives out of the ring and 'wants to get back in but can't' and other boxers won't even fight him it's unfair for him - that is boxing's own fault though.
I think what Rogan meant by not being a next generation of boxers, is after Floyd, Oscar, Pacquiao, and a few others, who is the NEXT GENERATION of "Holy Shit Guys"
MMA in general has more, especially younger guys, who are almost at or soon will be at that oh shit level.
I don't watch as much MMA as I used to, but I prefer the older guys I'm familiar with and will only look out for their fights; guys like BJ Penn, Frank Mir, Anderson Silva [guys who've been around a few years].
I don't know any of these young 'holy shit guys' in MMA?