Normally I find your remarks hit or miss, but this one definitely made me laugh.
The cutouts reak of Six-Flags level theming. It's a bit above Six Flags, but not really. I would consider The Hulk an unthemed coaster before I'd consider it a lightly themed coaster. I also think the ride itself is overrated. It's inversion after inversion making it disorienting to the point where you can't enjoy the elements of the ride. To me, Kraken over at Sea World is a better ride.
Spiderman is far and away the best ride in the park, and some would argue the best ride on the planet. The exterior cutout of Spiderman is meant to look 3D, but it doesn't really work. Once you get inside the building though, it's fantastic.
Even if they could legally build it, I think Disney would have to be very wary about building a Spiderman ride as the current ride in Islands of Adventure would certainly be used as a basis of comparison. If Disney's Spiderman attraction fell short in any way it would be poorly received.
Nope, they did lose Oswald to Universal though...
I'm guessing that Universal will look to pull the plug after Harry Potter is successful, or not at all. If they don't pull the plug in JT's time frame, I'd expect we'd be looking at 15-20 years at the minimum. If it's the latter they may remove the "Marvel" name and re-name it "Superhero Island" and base an attraction around another "non-Marvel" Superhero.
I don't think that's the case at all for the reasons I mentioned above. If Disney builds a Spiderman ride it would have to be better than The Amazing Adventures of Spiderman - I would think that such an attraction would be a huge investment, and I don't see Disney making this investment for Spiderman. I think Spiderman stays in Islands of Adventure - and if it doesn't, he will only appear as a walkaround character in Hollywood Studios.