My school hasn't taken anyone new on since October AND they only pay per hour flown - no retainer. I would be suprised if schools are struggling to locate adequate numbers of instructors at this time of year given the decreased chances of being able to fly due to the weather. If you ran a flying school would you offer a salaried position right now unless you could maximise the asset? It would be bad business sense - far better to take advantage of part time pay-per hour instructors until the weather picks up.
VFE.