It seems to me the question is a bit more complex than that.
Canon is constantly working on 7 DSLR lines (1D, 1Ds, 5D, 7D, xxD, xxxD, xxxxD), three lines of compacts, and three lines of lenses (EF, EF-S, and compact).
Question is whether Canon can start another line of bodies with it's own line of lenses (an adapter could be used to make EF lenses compliment this line, but Canon would have to make some new lenses), with money earned making more than the money lost in adjacent camera lines. Making EVIL cameras might make Canon stretch itself too thin.
Considering there are 7 announced lenses that haven't reached the market yet, and the recent events in Japan, I'd be surprised if Canon announced EVIL cameras in the near future.