You guys are correct that the smallest CSeries will be more than 115500 lbs. so that is not a likely aircraft. My bad.
However, the issue is and remains DAL Scope (and the scope at all majors). You guys give up scope for $$$, the bottom will drop out at the regionals now and the majors will get squeezed from the bottom by the DCI carriers and Emirates et al from the top. It won't be immediate but the end result will not be good for anyone if you want to live and work from a US base.
I hope you guys can hold the line. Otherwise, might as well sign up at Emirates before everyone else realizes we're all screwed. Never want to be at the back of the line!