monsterer, are you aware of the potential for entirely decentralized cross-chain exchanges?

https://bitcointalk.org/index.php?topic=193281.msg6487835#msg6487835

https://bitcointalk.org/index.php?topic=515370.0

Note however there are unresolved technical issues, thus I think your exchange is not threatened immediately, if ever.

I am a bit too sleepy to elaborate on the technical at the moment.