The market is so hot because old fashioned chief pilots still think that only widebody-guys can fly widebody, excluding all highly experienced medium jet drivers from their market. Good for the widebody guys, bad for the chief pilots
If I would select pilots for my airline I would rather put emphasis on how the pilots are, not on what they flew before. You can set ANY B737 or A320 pilot in a B777 with hardly any problem.
Dani