Why do you not see more m4/3?

It's because of how people research products:

They don't.

There's pretty much no marketing for MFT products in the English-speaking world. What little advertisement I've seen for micro four thirds cameras has been targeted toward photography enthusiasts. It's in photography-oriented publications--elsewhere the presence is almost nil (except for occasional reviews from PC Mag and Wired, which target technology enthusiasts in general). Several years ago there were some cable TV spots for Olympus MFT...but only a tiny fraction of what Canon and Nikon advertise every year.

The only people buying MFT are people who have such a vested interest in photography that they're willing to do extensive research online (this kind of user is also buying every other make of camera too). But the thing is, most consumers don't do research, and most people toting DSLRs at Disneyworld or at national parks aren't photography enthusiasts. They're camera users, insofar as anyone with the Instgram app is a camera user, and they're just looking for a solution that gets them more usable photos in a broader range of conditions...better low light than a cell phone, a real zoom lens, the perceived better quality of a big camera. Basically just the talking points that a retail clerk at Walmart or Target or Best Buy is prepared for, or the extent of the product blurbs on Amazon. That's it.

Every electronics retailer carries some Canon and Nikon DSLRs. Best Buy has a consistent presence for Sony E-mount as well. But everything else is pretty much invisible to the typical consumer. I'm not really surprised that MFT, and mirrorless in general, is uncommon around the necks of the average tourist.