You need to have both a suitable aircraft and a company with the business model to fly the routes.
As to aircraft, only the max8 and a321neo have the range to be really suitable. Westbound in the winter requires additional range that would require a refueling stop in the other models you mention, and that is no way to be profitable on any route. These are both new and in comparatively short supply. The aircraft and operator both need ETOPsETOPS ratings.
It is difficult to build a transatlantic business around a particular aircraft if it only just barely has the range for the closest city pair, meaning any expansion requires a second model. Ryanair, Southwest, etc. may not find this attractive.
Widebodies can fly from any US city to any European city. WOW uses the a321neo for the shorter routes, but also has a330s for west coast cities. WOW uses Iceland as a hub, already partway across the Atlantic.
While I think that flying narrowbodies across the Atlantic will grow, just barely good enough for a handful of airlines makes this arrangement unlikely to dominate given the flexibility of the widebody competition.