Personally, I’d prefer to see duel decks being more tightly themed. E.g. a Reina vs GRNDL Duel pack if they were to have done one during the spin cycle. Something that I feel more experienced players forget about is the hugely powerful immersive experience of first picking up a game that takes you into a different world, with heroes, villains etc. Netrunner does this incredibly well as you first start playing.
It’s another topic, but I wonder whether the design is still as strong from this perspective (it certainly lost a lot of it through San San and Mumbad imho). Flashpoint was mostly good, Red Sands a lot less so. Kitara seems alright, but my perspective may be skewed by familiarity. For what it’s worth, my pet theory is that a degree of genericism is your friend, as it means that everyone is in some sense familiar with the universe and has an anchor on which to layer in detail. However as more specifics are fleshed out, not only does this require more mechanichally awkward cards, but the feeling of ‘familiarity’ is harder to capture. (Note that this is probably less of a problem for games based on established IP such as Star Wars).
Perhaps that’s all BS though.
Other ‘Save the game’ ideas that I think would be good are cycle-packs for completed cycles (I and others have said this before), and perhaps the opportunity for ‘deluxe’ versions of the same or of other products. This is for two reasons: firstly, if someone is prepared to pay more money for some sort of collectors ediion of the core set (maybe with nicer tokens, a playmat and alt art ID’s) then great, that can subsidise the rest of us / provide promos to give out; secondly, I think it makes a difference buying in to a game where these products exist as it shows that there is a high degree of commitment from the player base, and a desire from the manufacturers to produce something lasting and of good quality. (There is also the marketing idea that the creation of a high end version of a product can make the regular version seem like a better deal, but there’s already a load more marketing stuff that FFG could be doing.)
Anyway, sorry for the mind vomit.
TLDR: The important stuff is in the first paragraph.