Of course future is unpredictable, otherwise it would be too easy to trade....
My personal opinion....just to talk a bit and not any kind of investment advice.
When the fork will happen there will be 2 different btc....1mb size and 2 mb size and this two tokens will have their market value most probably influenced by the supporting hashrate of course in the first days there will be a lot of huge volatility...frankly i don't know if on one coin or both or which one....
What is not clear to me is this:
If they did the NYA and already let's say 50% of the fork was done (segwit is already activated) why there will be 2 btc and not only one?

they should move according the agreement....i'm not supporting one side or the other...for me as an investor i want things calm and steady