I'd say for the first time since the cold war we are in a position where it is easy to imagine we could be in a conflict where we (the west) are very hard pressed to establish air superiority.
That would make for a long fight. Joint (in which I include NATO joint) warfighting doctrine hinges upon combined arms, airborne fires included. You have to establish at least local air superiority for the rest of it to work. Establishing air superiority thus becomes "phase I" of a given operation.
Air dominance can be worked out in due course, perhaps.