Well, honestly, I always felt like LotR came in right around the time that I was figuring out the Star Wars prequels were a bust, so the Middle Earth movies were already filling the Star Wars void for me (and the Hobbit movies haven't really done much for that, tbh). If Star Wars comes back with a vengeance next year, then as far as I'm concerned there is no void, lol.
But yeah, I think the upcoming batch of video game adaptations actually have the potential to be the first GOOD video game-based movies ever, and if any one of those spawns a good franchise (Warcraft, Assassins Creed, Uncharted), then those combined with the Star Wars and ongoing superhero franchises will give me more than enough fantastical adventure and will almost certainly leave me with zero longing for Middle Earth.
There's also a return to the Harry Potter-verse coming up too, but I bit more wary of that one, largely because I don't yet know anything about it, really. But that was a VERY rich universe with plenty of potentially good stories left in it, imo, so it could spawn a new franchise, too.
That said, I'm still waiting on my Dark Tower adaptation. Zelda would be cool, too.