Versus a new engine, from a proven company, with outstanding engine service? And, if GE’s numbers are correct, ten percent better fuel efficiency? And an 850 to 1600 SHP range? It was GE announcing that their new (and late) Catalyst would be FADEC that got P&W to finally put FADEC in select few PT6 installations.
New engines don’t scare off customers, look at the success of the CFM [GE/Safran JV] LEAP-1B engine.
Cost will be the determining factor, to be sure; it can likely be a little higher than a PT6 and still make it, but not much higher.