I assume that BTC price will fall after the fork because the people will go back to their recent altcoins (assuming that they only moved to / bought bitcoins to get free btcgold); Anyway, the price fall won't be permanent because late adapters will most likely buy bitcoins in the dip. Geez, it's hard to tell huh. ha ha ha. But one thing is kinda certain to happen, people will sell bitcoin gold to get more bitcoins.