100 to 200 million seems like a pretty poor sum of money. It's not much compared to the value that is Marvel. Are you assuming the hype for Marvel will die down as well? And why would they choose the Marvel area? They aren't Disney. They keep their rides well maintained and that area of the park is very nice. I don't expect the recently refurbed Spider-Man or The Hulk to fall apart in 5 years. Do you? Yes Marvel is more popular these days but that doesn't mean they would need to refurb the area. They already have the well maintained land as previously mentioned. Spider-man is a world renowned ride. And if they want to build something new, well, Id say even if Disney tried to block it, they would have a pretty darn good chance of winning in the courts. There is no indication whatsoever Universal is not following that contract to the T.
Not to mention, they have other area of the parks they can do a lot more with... think about Toon Lagoon, the rest of the Lost Continent, ect... There is plenty they can do and probably have more incentive to refurb that the Super Hero area. Those are the problem areas of the park, and they certainly don't need Disney's money to solve the problems there... As you already admitted, they are going to come out of HP 2.0 with gobs of money. And especially not for a measley 200 million, when the value of the Marvel properties is decidedly more.
You can do a decent amount with 200 million but the costs of things continue to go up and for example, Disney couldn't even build a full land with that amount of money. Universal gets more for their dollar but they can do a lot more with a billion than 200 million. And yet again, they have absolutely no incentive to lower the price and settle for such a paltry amount. They won't need the money from an outside company.
