It would be nice, but there simply isn't the demand. The Geneva flights last winter were mostly hit-or-miss, and I doubt they'll be as many this winter.
You do have to remember, the Q400 does have the range, but it also needs a a good load of people each time to make it pay, what with fuel being the cost it is now. Plus you have to look at the schedules, doing flights like these loses a hull for most of the day, so the other two will need to cover all the usual flights, and that would mean less MAN and LPL rotations. Otherwise, you'd have to fly in a fourth hull and crew to operate it which pushes the price right up too.
You can be certain, that if it is possible to make it pay, Flybe commercial will look at it. They don't miss many opportunities if they get a sniff at them.
Yesterday's delays were the result of that tech Q4 plus a last minute a/c change to get one of the others off to EXT for maintenance that couldn't wait and couldn't be fitted in earlier. Shame it was a Friday too, but the crews did their best.
the end result was about 11 flights late, out of 25 operated. A bad day granted, but you never hear about the rest that ran like clockwork though.......