Expansion space = not replacing something. The Simpsons replacement is a ways away anyways, I'd assume.
I mean, I know you really like Nintendo and want it in the parks, and I do too. But do you think it makes sense for Hollywood to remove WW for one ride after they get rid of SES and AA? I just don't see how another land with one ride is worth it. We already have WW, and SNW coming up. Both I think were very necessary for getting those properties in the park, but now that we have them I think Diagon would be a bad fit for the same reason, and I love the land and am a major HP nerd.