I disagree. For Mario, what ride is completely obvious other than Mario Kart?
Let's take a look at the comparisons:
Mario: Yoshi ride where you are traveling through a Yoshi adventure on the back of your own 'yoshi' vehicle.
LOTR: LOTR ride where you are traveling through a LOTR adventure on the back of your own 'mythical creature' vehicle.
Mario: DK ride through jungle/caves where you are on a cart.
LOTR: Hobbit ride through goblin-town where you are on a cart.
There's dozens of other potential concepts, including a Poseidon-clone, dragon roller coaster, Hagrid clone, a Spider-man clone, a FJ clone, boat ride(s), etc. I mean honestly, LOTR lends itself to theme parks just as well as Harry Potter does.
That being said, I don't think LOTR will be at Epic/Fantastic Worlds.
I think it'll be at Dry Park 4 in 2033.