My guess would be that bitcoin's price will dip a bit. Probably just as low as 5%-10% as I think that a lot of people will go full FOMO because of altcoins currently skyrocketing in price. Also, knowing that most people realize that they aren't getting any free forked bitcoin as s2x has been canceled.
All this while, people has been withdrawing their money from altcoins and Investing on Bitcoin all due to the hard fork that was to take place on 16th this month, and through out then, price rate for altcoins kept on decreasing. But after the announcement, I noticed some.slight increase in the price for Altcoins while bitcoin dipped small.