So, I'm just "blue-sky-ing" here but I've thought the placement of MMRR was a missed opportunity for Toontown. The entire plot of MMRR is that we're meant to be taking a train ride with Goofy for a peaceful trip "around the park".
Mickey's Toontown has both a park and a Railroad station so why not take this time to expand on those areas and really bring them into the Toontown fold, while being able to present a modified version of the attraction without the need for all the "Hollywood movie" queue and "come see Mickey's new cartoon" shticks? It makes sense for Hollywood Studios, it's the ONLY way for it to make sense there but here in Toontown, we're sort of already in the toon universe, not stepping into it, right? I was thinking something along these lines:
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You enter through a newly expanded "Toon Park" for a train ride with Goofy. The queue could go over the DLRR via bridge and really tie the whole Toontown/Train ride theme together. The old Fantasyland theatre would be replaced with a new, modified MMRR show building (you wouldn't need all the indoor queue and show elements because in DL, you'd be losing the "jump into a cartoon" element).
While, they're at it, they could "turn around" the DLRR entrance and have it right next door to the MMRR entrance, thus "Toontown Station" finally is actually in Toontown and ties again, into the entire area.
Again, I'm just Armchair Imagineering here. I'm happy to see Toontown get a new attraction in any form.