It doesn't matter, people are going to notice a difference. Guests are going to expect Robert Downey Jr, Chris Hemsworth, Chris Evans, Mark Ruffalo, Scarlett Johansson and everybody else, not a comic. Sure, the comic aesthetic makes more sense for the land as it's timeless and will cost a fraction of the price.
Maybe doing nothing is better than doing anything that will never meet the high standards that guests will be expecting from a modern Marvel attraction.
The only ride I would give a pass to is Iron Man but seeing as that concept is in development hell, I can't see that happening any time soon especially with everything else that is planned or rumoured for the next 5 years.