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Looks like the poll is split fairly evenly. I think it might be due to differing personal definitions of what a megalopolis is. Is there even an official definition? To me, it implies that there is one great, dominant central city that all the other smaller cities and towns depend on. Basically a MSA or CSA.

That being said, I don't think LA-SD fits this. I've always thought of them as being their own thing. I don't think SD relies on LA economically the same way as Long Beach or Riverside might. Just because the fringes of SD's metro have sprawled all the way to nearly meet the fringe sprawl of LA's metro doesn't turn it into a megalopolis, IMO.

Likewise, I wouldn't call SF-Sacramento a megalopolis either just because of developments in Vacaville, Dixon, and Davis connecting them.