What would you do?

Olympus has no plans to offer  4/3 solution in the price range of the E-30, as far as the information on it goes, and certainly not a Dslr in that range. They are only working on a higher priced solution for the 4/3 lenses, that may or may not be a Dslr, but probably something more advanced and possibly a hybrid solution. The technology from that may trickle down eventually into a more affordable camera that could replace your E-30 in 2-4 years time, but that's all very uncertain.

If you want to know what to expect, than I guess Full Frame is a good choice.

Good luck deciding