I think it will destroy the market for a while. Any ideas?
It won't destroy the market, not even close.
What we can expect is a dip in btc price, resulting in widespread panic and confusion from newcomers and the like. We can also expect a surge in the price. To be fair, there's a lot of uncertainty around the upcoming fork so it's really difficult to predict accurately what would happen during/after this event.
But if you take a look at the price right now, btc stands @6580$ on Bitstamp, that's more than 400$ increase in just 2 days, this kind of growth isn't normal and the cause of it could be a lot of things (the new chinese exchange, the CME announcement, Amazon rumours, etc) but one of them could be the next hard fork, so maybe the SegWit2x hard fork is already affecting the market.