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If somebody has even the faintest inkling that they might need or want to pick up a full frame camera, going the Sony route will be much more efficient. Sony's E-mount lenses work with both APSC and full frame cameras, so you've got an actual upgrade path. And if you end up with both types of bodies for any reason—and there are plenty of reasons—it's possible to share the same lens across both. This simply isn't an option with M43. (Note: Before anybody jumps to make an argument out of this... yes, lenses intended for APSC cameras will usually produce vignetting on bodies with full frame sensors, but the point is that you can do it, and it's not that bad to crop off the edges. More importantly, you can use an EF lens on an APSC body and it works perfectly.)
There's also the subject of lens quality. I'm not talking about the low end where the quality is roughly the same. I mean, it's not like M43 lenses can't easily match up against Sony's kit lenses and some other entry-level glass from Tamron and Sigma; but as you climb the ladder, even at mid-range, it's increasingly rare to find comparable M43 lenses. The manufacturers just aren't investing in that part of the market. And once you're talking about high-end lenses, it gets harder. (Note: again there are exceptions here, but they are almost universally cine lenses and the prices are actually much higher than comparable options for Sony.)
We could also nitpick the feature differences between Sony cameras (specifically the slightly aging a6000) and various M43 cameras all day long, but that would go nowhere fast. Every system has fans and they'll point out how they couldn't live without some feature. I like Sony's feature set, and there's not much worth saying after that.
None of this is to say micro 4/3 is bad or that it should be avoided, just that there are other factors that may be important to many people beyond reaping the benefits of a bit more competition between brands. There are also other things to consider, like sensor capabilities, software and accessory ecosystem, proprietary components, and such... but I've already gone on long enough.
M43 has some really nice cameras and lenses too. In particular, the constant aperture zoom lenses are fantastic and more compact than what can be offered by larger sensor systems. Sony doesn't do well at this and I would definitely recommend M43 for people most interested in zoom lenses on a compact system. There's plenty of shooters who will be very well served by the outstanding performance and value of Sony though.