With the release of the last box for the saga, we are probably facing the last year of the game in terms of new material. We will still probably see a new deluxe expansion based in Dale/Erebor/Iron hills and its cicle, but beyond.
Personally, before the line ends, I would love to see some old cards re-printed with a "lift up" errata which would make them worth being included in a deck. I know there are plenty of such cards (see this thread for some examples), but it pains me to see some very iconic Middle-Earth stuff that is not worth putting (nearly) in any deck. For example, Radagast or the Horn of Gondor.
I specially like the idea for Radagast from John Constantine or the much more thematically correct Horn of Gondor from Dav Flamerock. Another nice card that could use a lift is the White Council, which could nicely be errated to include the sentence "Players may spend resources as a group to pay for the White Council" in line with some of the new cards we are seeing these days.