They just need to convert a few regular Rex passengers to how much better it is flying into MEB than MEL, which is just another BUA.
Not if they're flying to Wynyard from somewhere other than Melbourne. Why would you collect your bag, catch a cab to Essendon to check in again, when if you're on another Rex flight or Virgin, your bag is checked all the way through, and you walk a couple of hundred metres on you're on your connecting flight.
From what I've heard about pax numbers, I give it 6 months, if that.