The SL1 was a great travel/hiking body which would have benefited enormously from an update with the expected features. But if it's a slow seller, Canon won't be putting too much attention or development dollars on it, particularly with the M5 release. I had an extended test drive of an M5, and while I won't be buying one, it's a camera I wouldn't hesitate recommending to people in that segment of the market. My compact camera dollars will go into an MFT Panasonic GH5 to replace my just sold GH4.
-pw