No, 4/3s is not aimed at the pros. What may come down the road might definitely be.
That would be most interesting, and it would address the problem you see with pros complaining about huge pro kit. I am sure it could be done, but the question is whether or not it will be.
I have no doubt that digital photographic technology will eventually branch off from traditional photography and take us in places we've never been.
There have been cries for that for years. People asking companies to stop thinking of the camera as having to look like and function like an SLR or a traditional film-based point-n-shoot.
However, when the camera makers have responded with 'out of the box' thinking, mostly they've been a drug on the market, very little sales.
Take Casio's Exilim cameras - the ones that looked kind of like ray guns. Remember those? Now they look like the basic bar of soap.
Pentax experimented with a ray-gun shaped Optio (MX4) that looked actually more like a video camera. Now all the Optios look like bars of soap.
Or Nikon's great twist-and-turn Coolpix series. Now they look like bars of soap.
Sony had a m4/3 style camera, sort of, in the DSC-R1. APS-C size sensor, bridge-camera styling, long zoom, LCD on top of the camera. Still a cult classic and not cheap, but discontinued. Now Sony point-and-shoot cameras look like bars of soap.
The camera phone is new - didn't exist in the film world. Due entirely to the technology. Most cell phones, they look like bars of soap. Skinny ones.
Bridge-style cameras are still big, and popular, as a sort of upscale point-and-shoot, typically offering longer focal-length zoom lenses and EVF. But they almost universally retain the dSLR 'hump' style design and look more-or-less like a shrunk-down SLR camera. Some of the latest long-zoom cameras with EVF look like - yeah - bars of soap.
But most of that is styling. If the camera behaves functionally in a different way than what came previously, then that's new. The small body / large sensor movement is becoming interesting, that's for sure. I see it aimed at the enthusiast market, with a limited appeal to happy snappers and pros. However, as you say, that could change, if the price comes way down (for happy snappers) or the quality goes way up (pros).
I'm not dissing m4/3. I like it. I'm intrigued and interested. I just see it as a limited niche. I will be interested to see if it changes direction.