MetaBones Speed Booster Adaptor

It's a good point; and you're right that I overlooked how many viable lenses there are.

It would still be interesting if they made a x0.5 converter especially for M43 (and CX?), but someone mentioned that Olympus had patented something similar, and perhaps the "one beautiful system" will end up as a camera accepting M43 lenses without an adapter, full 43 lenses with an adapter with a electronic LCD mirror, and finally the old film lenses with a "booster" adapter. ...But that's hypothetical while the Speed Booster is real.