The entire ethereum team should join bitshares as delegates. We could vote to sharedrop some BTS onto the ethereum donators, and the team could return whatever bitcoin they have left. They can then work to implement sidechains and make ethereum a bitshares sidechain.
Even if they don't join us, we will just get some developer delegates to copy their work and implement it as a sidechain, like CP did... So they should realize that they might as well join us.