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.
Y
Incase 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.