I agree that eventually FFG will do ‘something’ with the deluxe sets. The simplest approach would be to create revised versions of them, just like they did with the core set:
Replace a bunch of cards with cards from cycles that have already rotated.
This would allow them to get rid of both duds and cards that restrict future design space by being too efficient.
At the same time they could rescue some staple cards with a reasonable power level from bygone cycles from oblivion.
If they do plan to release more completely new deluxe sets, I’d expect them to be in the vein of R&R, i.e. supporting all identities equally.
I also consider it likely that they will release another campaign set, though, covering the identities that weren’t included in Terminal Directive.
Once there’s two Campaign sets and two deluxe sets supporting all identities equally, they could safely remove the old deluxe sets from the pool.
And then there’s a third option:
They could go the route taken with Game of Thrones and release ‘starter decks’ for each of the factions. These could eventually replace old deluxe sets, as well, containing a mix of old and new cards.