Doubtful. Aside from bitcoin.org's history, if it were, you'd expect more exchanges announcing UASF / legacy / SegWit2x trading pairs.
hard to price unless a fork actually occurs.
if a fork like ETH/ETC happens, exchanges do benefit.
True. Guess I'm surprised Kraken et al haven't already announced that they'll support all chains, though? I guess they're all quietly prepping in case more than one chain is viable.