Willie Walsh has said that IAG could see C Series as a match for some of the airlines within the group. That might well be BA. I cant see easyJet at this junction going for this change in direction given it has commitments made to NEO etc. More generally IAG going for C Series could be good for Aer Lingus given then a great aircraft for thinner routes and new route development.
EI-BUD
Don't see it, Airbus will get some increased business within 6-12 months if word on the street is to be believed.
Perhaps Fly Maybe will get some to replace E Jets? or BA CityFlyer for growth?