More relevant question: the number of potential enemy fighters which can outrun an AIM-120 AMRAAM (Mach 4):
zero.
But anyway, Australia plans to replace their entire complement of fighters (Hornets and Super Hornets) by the F-35A. They were forced to buy the Super Hornets as an interim measure to replace their antique F-111s.
Norway, the Netherlands, etc., will similarly operate only F-35s in the future, replacing their entire fighter inventory with a single model.