OK, first up I'm just a hobbyist. I bought a M5 last year, partly I wanted something smaller/less attention for days out, e.g. trips into London. When I progressed through 20D & 7D to a 6D, the difference in IQ was amazing. But sensor tech has moved on; as such I was very pleasantly surprised by the M5.
I feel overall that we are at a cross roads, with the new R mount and so on. I too expect the current low end DSLRs to become mirrorless, so do expect an R Crop at some point.
A health gremlin also focussed my mind on lighter gear, so I've let GAS get the better of me. I've bought an XT-3 + Kit lens to play with (£200 trade in bonus for ye olde 20D!); my wife has happily taken the M5 off me (likes the EVF, as she'd be using a Sony RX100 Mk1).
So no, I'm not ‘dumping Canon'.. at least not yet. I may well swap my 6D for an R at some point, as I have a nice EF collection. But I'll give the Fuji a go first. As sensor tech improves further, I do feel that for many of us non-pros, full-frame (though lovely) is now overkill; especially when there are pros using Fuji and M43.