I prefer the concept for the new entrance but the old one was faithful to the comic book theme of the area whereas this is not.
I have seen rumours that the whole area might be getting a retheme soon and there is the possibility of a new Avengers ride. It wouldn't be a shock if the whole area started to look closer to the Marvel Cinematic Universe look rather than the 90s comic books.
I think it has something to do with the licence between comcast and Disney.
Under the agreement I believe that Disney have agreed not to build anything to do with marvel in the Orlando area. But for this to happen comcast have to keep all there marvel rides in tip top condition.
If Disney believe that say for example the hulk coaster is not in top condition they can take the licence off them!
It sounds extreme but I think that is how the agreement works.
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The agreement doesn't just state that Universal have exclusivity for Marvel in the Orlando area, its anywhere East of the Mississippi. So Disney can use Marvel in all their parks except WDW, but it does also stop them building another Marvel east coast park. Also don't forget the contract was made in 1997, it has nothing to do with Disney, so it also stopped Marvel partnering with Legoland or anyone else to build a park on the east coast.
The contract is between Marvel and Universal and yes it does have minimum standards for the condition of attractions, I don't think the quality of the ride of the coaster would be a deal breaker, I think the appearance of characters etc would be a bigger issue.
Universal also have the contract with Marvel in perpetuity, so as long as they don't mess up they will never give up the rights.
In general Disney (as an overall company) are pretty happy as they make most of the money from merchandise. So every toy for sale in IoA gives money to TWDC.
If you want to read the contract, its here
https://www.sec.gov/Archives/edgar/data/1262449/000119312510008732/dex1057.htm
But there are lots of good articles on this including
http://www.themeparkinsider.com/flume/201307/3558/
Also Disney are free to use Marvel in California, Paris and China. But seem to be quite slow. There are rumours of changes at California Adventure (Tower of Terror themed to Guardians of the Galaxy and some new rides) and WD Studios, Paris (RocknRoller Coaster to Spiderman, Apocalypse to Fantastic Four) though.