There is going to be no new operator that will sign up on a promise of a new terminal. Blackpool had a small terminal and BB destroyed it, it also had the equipment to run a passenger operation and sold the lot.
The best that can be hoped for are a couple of portocabins bolted together for a small IOM operation and that is it. The days of Airbuses and Boeing's operating out of Blackpool are gone forever as there is no profit in a handful of flights operating each week at random times in the day out of a newly built terminal that like the old one will be empty for most of the time. Also with the introduction of the living wage, wage costs would be no doubt higher than before.