Itīs going to be very hard to make an area that can host all the Marvel characters in a good way. Fantasyland is supposed to be a mix of stories that come alive. ...Marvle land will be like a place that brings all comic book characters to life... like a B-grade Fantasyland.
The only thing that the Marvel characters seme to have in common is fighting in big city environments. That alone would take up alot of land unless they make it a street and nothing else.
A ride with Marvel theme would have to be housed in a big building to fit all the action scenes that are needed. Where would they put a land with 1-2 rides? The only good place for that is behind Fantasyland.
If they made it like an extension of Fantasyland... like a comic book street, it could work. Otherwise itīs going to be made in a bad way.
A new small land with one big ride and many photo ops.
Just like HKDL does every time they add a new land.