FlyBe have firm orders for 4 more Q400's (due in 2011) plus 15 options and also 12 options on 195's, so they seem to be covering all the possible future scenarios which have been mentioned here.
They have also been mentioned a possible customer for a stretched Q400X which Bombardier have talked about launching in the past. This could bridge the capacity gap between the Q400 and 195, whilst retaining the former's economics.
However any move towards Q400X's or 170's would create sub-fleets which seems would seem to challenge their two type model approach.
I suspect though, that having apparently weathered the worst of the economic storm, FlyBe's strategic planners will be looking at all their options to be in the optimum strategic position when the genuine recovery arrives, and will soon be looking at what they do with those options from 2012 and beyond.