I guess it's possible since we have CLTV, but the question is why?
We have been able to do the same thing with our smart contracts for a year already. Actually I think our smart contracts are superior. The solution you are linking to requires every participating coin to have CLTV. The BitBay client can be used to trade any coin safe and decentralized.
Smart contracts are really nothing to do with it, its about cross chain transfers to exchange the usage of services on one blockchain with the token value of another, or perhaps simply trading one token for another trustlessly.
