But I think what matters most is people's anticipation of future value/price of both chains. If their view is that slowed transactions on 1x is just temporary it may have little effect on price. OTOH, as btc1 is already one or two software versions behind Core, and prospects for competent maintenance going forward seem increasingly dubious, it seems reasonable to expect it to trade at a discount to the legacy chain.
Given that hash rate does not directly affect trading on exchanges it seems reasonable to me people may sell whichever chain they don't favor sooner than hash rate can affect the price via people's perception that the legacy chain's tx throughput is a problem that will make it worthless, or worth less than btc1.
I hope my reasoning doesn't seem to muddled.
Anyway, just my 2c.