I am going to hedge my bets, I will sell a portion of bitcoin pre fork and invest in alts, then I will sell another portion post fork to invest in alts (if the signs are looking good) and finally I will leave the rest in bitcoin throughout.
I think the result of price drop below 7100$ now of btc is due to people have actually started selling already now itself. There is still time left for the fork to happen and thus if this continue we can easily see the btc prices felling below 6500$ in coming days which may not be a good thing to happen.