Holdem is too solved at this point, this is why it's dying and soon PLO will suffer the same fate.
One idea i have is "double pot limit omaha" which is like PLO high except you can now bet up to twice the pot.
btw: i have lookied into all current pokergames and they all have issues, NLHE is still my favorite game.
Ideally the game should be
1. no limit
2. not solvable by current computer hardware or even close.
3. easy for normal people to understand.
One game i have constructed satisfies 1 and 2 but not 3 with current rules.