Who else is cashing in before the fork wipes out Bitcoin? I don't have much but will quit while I'm ahead.

I don't think you understand what a fork is. Let me draw you a diagram.
YIncase that didn't get through to you, you'll own just as many bitcoins as you did before. You'll just own two different kinds of bitcoins. If the price drops then you've lost brain dead sheep to the slaughter. It's not a big deal.
Yeah, but one is going to continue and the other will shrivel up and die. It isn't up to us, it is up to the big mining groups. If they go to BTU then BTC transcations will take even longer to process. Whichever gets 51% of the miners will have won.
Then five years down the line they fork again. What then?