I'm afraid that SO could become a lonely place. Wasn't there a discussion about failing by competing for the same heads?
closed as not constructive by Brad Mace, jonsca, Pops, Rory, Josh Darnell Aug 14 '12 at 17:14
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Since, according to Alexa, StackOverflow has over 30 times the traffic and number of visitors, I would guess the answer to be "no".
Stack Overflow is a better place for the reduced level of fluff. If fluff is what you came for then, by all means, go to Programmers. We'll all be happier that way.
No. Not enough of them have done so.
Only for single core developers. Multicore developers know how to multitask and can be at several sites and have some work done at the same time.
I wouldn't worry, both sites have different goals (and personally, I still follow both :-)