Bitcoin's bullrun might end even before the fork, if the "free money" isn't enough to justify not selling on the premium caused by the fork hype.  The smart traders always seem to sell on the hype before an event, not wait for the actual event itself.

This is the time to be buying the good alts, not selling.  It's too late to get in on this bitcoin push if you haven't already.  As bitcoin's price continues to increase, so does its risk, and the profit to be made diminishes.  Traders are already looking for the next big flip, and that will come from an altcoin.  Which one is the question.