No thanks, if Canon won't support their own product lines, I'm not going to give them any more money for it. I love the M, but I'll switch over to the SL1 and use all my EF-S lenses if they are not fully behind the M. Or maybe get something completely different.
We own both the SL1 and the M, along with a 5D3. To my knowledge, there is nothing that comes close to the EOS M + 22mm from a size/image quality perspective. You can use the 40mm pancake and be in the right ballpark from a size perspective, but that's not nearly wide enough for a general purpose setup - for my preferences, at least, and it's slower and potentially not as sharp wide open.
If Canon released a 20-24mm pancake EF or EF-S with similar image quality to the EF-M 22mm, I might consider getting rid of the M. Until then, it's a very handy combo to have around.