Thanks everyone!
Of course, I've already invested some funds into my Canon system (though I'd also be willing to sell it all). Plus, the image quality for Canon is really great. That said, the equipment is increasingly burdensome to carry around and while Canon has great lens options, because I'm not a professional photographer, there are a lot of lenses that I really won't ever need to use.
Basically, I'm looking for a system that is smaller and lighter, but without a serious drop off in image quality.
The M50 is a good fit; you can adapt your existing EF glass to it, or, take around one of those new 32mm f/1.4s... I know you didn't ask.
Fuji is a good standalone system, if you want to pick something small/light, but it means switching whole.
The EOS R, is lighter and smaller, but not a lot so. Canon's chosen to make IQ a higher priority than the weight/size savings, except, with the new 35mm f/1.8 M IS STM, which is akin to the aforementioned EOS M's 22mm f/2 which is renowned for being tack sharp, lightweight and low-light capable. Nikon is choosing more weight savings and less performance on the other hand with their Z (I know you didn't ask either).
I went from 5DIII and L's, to EOS M, and then to G1X III, talk about extreme. Similar reasons, the big stuff got left home, smartphones don't cut it.
Now I'm coming full circle, I'll (probably) be buying the EOS R and 35mm f/1.8 M IS STM for take everywhere candids, and a native RF 24-105, RF 50mm f/1.2L plus adapter. Not cheap. But, the EOS R represents about a good 15% weight savings with native lenses over the 5DIV (1595g for 5DIV + 24-105 vs 1360g of the EOSR + RF 24-105; 1135g for 5DIV + 35mm f/2 vs 965g of EOSR + RF 35mm) but you gain IQ, not loose it for the 15% weight savings.
Going to Fuji or the EOS M is a compromise, you'll loose IQ, the question is how much is acceptable? I miss it, and am going back. But, it depends what you shoot. If you're shooting fast glass, that's something Fuji in particular can do better than other crops, but, it's still not FF, darn close though, but it still is close, not the same.
My advice? Pickup a nice point and shoot, say a G7X II or RX100 series, drag it along when you don't feel like the 5DIV and give yourself a break, or look at an M50 and adapter with a 22 pancake. Fuji is an excellent option if you don't need fast glass, or have other reasons like 4K, then yes, Fuji should be on your short list.
I don't have a 5DIV though, I'd need to pickup something like the EOS R to get back in the FF game, and I'll take the 15% weight savings and better IQ. When I get sick of even the slightly lighter EOS R (I'm sure I will), the G1X III will be there for me...