I definitely think that MFT is here to stay. And i consider that to be a good thing. The facts speak for themselves- the format can bring high- end technology to a consumer level (imagine if Kubrick could have shot movies at iso 1600, F0.95, with a budget of 2000$). And yes it is currently expensive, but at the core it is rather overpriced than inherently expensive, and in free-market economy, that is bound to change.
While we're on the subject- it also kind of pisses me off that every manufacturer needs to have a new mount for every new camera system they release, but cameras come and go, but the glass stays and every lens made has a character, and MFT is the only way all of these lenses will still be usable when, inevitably, some of the current mounts go obsolete. Plus, with circuit manufacturing costs constantly lowering, with the next batch of dslrs, in 3 years, the crop sensor dslrs could as well be abolished completely, as it wouldn't make sense to put all this expensive technology around a cheap piece of silicon. So it would make sense that the sensor sizes would converge to MFT and FF (probably also E-mount and mirrorless aps-c s).