Originally Posted by BullMcGiveny
Well, Thor: The Dark World would have to establish that it is used for more than opening portals and as an energy source. And it'd have to end back on Earth.
But I think they can deviate from the source and go with something else. Maybe just having frequent run-ins with Steve will trigger some memories to be remembered.
Avengers already proved that it does more than just open portals and provide renewable energy. Selvig and Hawkeye, as thralls to Loki, used it to gain extensive knowledge and even see into the near future.
But no, I wouldn't want to see the Tesseract be the cure for Bucky's memory loss....there's plenty of real-life cures available right now here on good ol' Earth that could believably be used for that. All he needs is a pill or a swift roundhouse kick to the head to snap out of it.