No chance they will stop or go away, but its possible that a class here or there may not have any 320 positions.

It just depends on the number of prior AE openings, sim/instructor/OE availability, etc. While we will need new pilots for that fleet for a very long time, its possible a class every once in a while doesn't have that one plane that one time.

And even when a class does offer it as a "new hire choice" there will usually be several other aircraft choices in that class. So a given New Hire may not be able to get the 320 in class anyway depending on their seniority in class.

I assume you're asking because you hope to get the 320 as your initial aircraft. Without knowing any other factor, I'd say that if that's what you want your odds are probably fairly good. But obviously take the first class you can get into and don't delay hoping for a (slightly) cooler flight deck.