That depends.
1.)If we have a chain split then that will be the worst situation as neither 2x or core team is implementing replay protection.It's not decided which people will treat as real bitcoin.Many will lose value because of no replay protection and price will be almost equal on both chains. (2000$+)
2.)If we don't have a chain split or bitcoin core finally gives up to 2x or 2x agree to implement replay protection then it will be treated as an altcoin and we will have the same fate as Bcash split in that case bitcoin price to the moon
I generally agree with that various scenarios are possible and the price depends on what users and companies decide. My prediction is only a little bit different, because I think there is a difference between the scenario "Core wins" (more bullish) and "Segwit2x wins" (a little bit more bearish):
1) Bitcoin Core "wins" because not enough hashrate (less than 65-70%) changes to Segwit2x: This is the easiest one - Segwit2x will then be marginalized fast (it may even die because the big blockers already have "Bcash" as their favourite toy), Bitcoin's price should be not affected or even increase - that would depend on market conditions.
2) Segwit2x attracts 65-85% hashrate for more than a week, but Bitcoin's original chain keeps being usable (e.g. because new hashrate steps in): In this case we could see a long fight. I predict that this will throw back the whole Bitcoin movement and I don't rule out prices below $1000 for that scenario - for both chains.
3) Segwit2x attracts over 80-85% of the hashrate for a long time and the original Bitcoin chain becomes unusable because of that. It is very likely that the Core team will then implement a "nuclear option" hard fork. This would, however, mean that the "Corecoin" will most likely become the altcoin of both. If the Segwit2x coin gains acceptance and becomes then the "real Bitcoin", I predict its price will be lower than now because of the uncertainty regarding a new and stable development team, and because some "idealists" will leave Bitcoin.
4) Very unlikely: Segwit2x "wins" the battle like in the previous scenario, but the Core team grudgingly accepts to continue to help with development. This would be bullish, perhaps even more than the first scenario.