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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 !