As far as M43 being niche..........it's been that way for a long time. IMO, OMDS recognizes this and aims it's marketing accordingly.
I wish Panasonic would, they`ve ditched all the compact M43 cameras bar the G100 and stuffed the G9`s replacement into a bottom end full frame body . No wonder used GX9s, GX80s and even GX800s have gone utterly crazy price wise and forget the GM series, almost Collector prices .
Panasonic didn't ditch the compacts, camera buyers did.
But think about... if you don't update your products with relevant tech present on competing devices (which got the preference on the market), you are literally ditching your products.
Of course there are technical limitations but compact cameras were quite abandoned on relevant tech which is what a big bulk of the market want, and find on smarthphones. That can't be ignored too.
And I think that is unfortunate, I see advantages and would prefer compact cameras would still be there strongly.