Are you kidding? From a purely partisan perspective, this isn't a "happy thought" at all; Dean, Pelosi, and Reid are wonderful for the Republicans.
But on the other hand -- and this may not make me very popular around here -- I would like to see the extremists in the Democratic party go, because I would like to see a viable and sane Democratic party around to challenge the Republicans. Competition is good; competition produces the best outcomes, and as long as the Democrats are the party of crazies, the GOP has no competition.
You are correct..however, what emegers to replace them will be worse..more partisan..the Dem caucus is cannabalizing itself..