If they use just the space of the current building behind the coaster, it's about 40,000 sqft.
If they move some roads around, they could probably get it up to maybe a little more than 70,000:
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I don't know what's back there that can be moved or not moved, but this only gets rid of open space, and not any of the other backstage buildings.
For comparison, Haunted Mansion and Small World are both around 60,000 sqft, and Pirates is over 100,000. Runaway Railway is 85,000, although I think that building also includes offices, so the actual square footage of the ride might be smaller. Rise is 75,000, not including the queue.
Little Mermaid and Spider Man are both around 30,000, Winnie the Pooh is 25,000. Monster's Inc and Roger Rabbit are 20,000.
So if they used just the existing building, there's room for a C to low D ticket I'd guess. If they expanded it, you're at a high D to an E. Just based on size, not based on anything else of course