Do you think BTS will be migrated to the BTS blockchain ?
Possibly but not necessarily.
Cobinhood is a DEX running on ETH though it's not as great as BTS. According to @dan ETH can be run as a single smart contract on EOS. That should answer your question.
You make a good argument ! BTS is offering a specific solution to a future major issue (hack of centralised exchange or government intervention) which I think could push its price paraboliclly higher !