They need to work on making the IP more inherently attractive to use or license. The mechanics aren't special enough (or accurately used in games) to not be replaced with a new rules system, and the worlds and stories in them are not so well-known and popular that you can't come up with a...
Waiting on the 12 issue IDW series where the Transformers end up in Mechanus, followed by a Drizzt Transformer that turns into Guenhwyvar.
Beast Wars: Eberron, perhaps.
There's probably some room for a "free action" each round for limited actions, but the weapon swap being cumbersome is pretty important for preventing people from basically having two simultaneous loadouts they swap round after round so they can get two handed damage and sheild defense. It also...
Sliding in a reworking of 4E's Oublivae could be fun. She's all about bringing civilization to ruin, and you can always add the idea that she wants to end it in such a way that only she enjoys the knowledge of what it once was.
My preference for systems is generally based on:
I don't have to do extra work to make it interesting
If I want to do something new, it's easy and doesn't turn into me fixing things (requires good math and sensible rules)
Has default flavor I enjoy, so the flavor text isn't a waste of money and...
I find Paizo games exactly as immersive as any edition of D&D. Paizo's design is more clear and mathematically sound than most, with errata to minimize the need for house rules, which gives some folks the uncanny valley effect, but works fine if you already see how artificial every game is and...
The default Starfinder 2E vibe is incredibly 80s camp sci-fantasy. There are ancestry, class feature, and equipment options directly featuring music and dance. Just need a cyborg familiar archetype and ship rules and you could run a Silverhawks campaign.
There's a trend of moving from D&D to PF2E being jarring because the similarities and differences cause some crossed wire whiplash.
PF2 overall involves a lot more choices each round with better and worse outcomes, while 5E more or less guarantees a certain quality of life with each turn on...
Those are some of the worst classes to learn the game with. Investigator is good but very campaign-specific and fiddly and Inventor is not terribly popular overall. It's like learning D&D using classes from the Incarnium book.