As soon as Canon releases a full frame EOS M or similar mirrorless, they have me onboard with the M system. Of course assuming a similar IQ as the modern full frame DSRL cameras. For landscapes and general photography I will trade my 5D mark II for a much lighter mirrorless, any time (hiking is getting harder with all the weight of the camera + lenses).
then for wildlife and some sports I do, 7D mark II with tripod/monopod wouldo do.
Now the question is how long do we have to wait?
For landscapes the EOS M + 11-22 is a pretty good alternative for hiking. The IS makes it really useful for those sunset and blue hour shots. Plus if you need a tripod a much smaller and lighter one is all you really need. If you shoot RAW you'll not notice a huge difference between the end result (after PP) of this set up and FF. It surprised me how good the IQ from the M actually is.
The closest lightest FF equivalent of the above combo is a Sony A7 / or 6D with a EF 16-35 f/4L IS. I'll let you calculate how much the difference in cost is. You have to ask yourself are you getting that much better IQ? Better - yes but ten times better? No way.