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Abundance of gateways would help a lot. But that doesn't seem to be happening. Even Bitshares has very limited choices.

Yes - I think Bitsquare doesn't use gateways (unless I'm mistaken) but I'm not sure exactly how they get around it. I assume they use some kind of mechanism by which their software straddles multiple blockchains?

Quick look: it seems to be a peer-to-peer system with multisig+arbitrators. Here is the whitepaper: https://bitsquare.io/bitsquare.pdf

Cool thanks! I will give it a read when I have a moment. I understand they may be looking at doing some kind of ICO so it could be something interesting to invest in.