Here's a pathological scenario:
Let's call the BIP110 enforcing chain Coin A and the non-enforcing chain, which very well may be longer, Coin B
The two chains split. Coin A trades at 100:1 Coin B. M...
Yeah if enough people buy bip110 coins (does't have to be miners) then eventually the bip110 chain would have roughly equal value as the non-bip110 chain, and if the hash power was still lower it would attract miners. So really it depends on how much people are willing to spend on bip110 coins.