There have been talks of having Robert Downey Jr. return to the role if Iron Man, along with other deceased or retired Avengers. I know that Marvel Studios is in a slump now, but the way to correct things is to not saturate the market with sub-par product. Hopefully they will go back to what worked in the first place - concentrating on a few movies and shows a year and maintaining close quality control. To bring back characters that have already completed their arcs will smack of desperation unless it is really done well.