Do you really think the GB A320/A321s will stay in "British Airways" Pax configuration philosophy ? easyJet is not looking for such a confort in the cabine.
Do you really think people who have never flown other airbus serie than the 319 will be able to transfer directly on the 320/321 without any line training ? be careful with tailstrikes mate
If 2 BFS or AMS are not lucrative enough, you can always find lots of other routes to make money on a kind of 90 min flight time sector.
Competition is already pretty hard on the Canaries destinations...
But we'll see ...