I think it would be nice to be able to create map packages where all data is bundled into ONE geodatabase. Currently, if my map data is spread across multiple geodatabases, then the extracted map package also contains multiple geodatabases. It would be nice to have the option (maybe a check box in the tool) that bundled all the map data into one geodatabase.
My reasoning for this is it would be a good way to create a 'final' version of any map. Right now, if I want everything from my map bundled into a single file geodatabase, I need to manually move the data into that one file geodatabase. Then I need to redo my data sources, in the map, to point at the one final geodatabase. Potentially, a map package option that bundled data into one file geodatabase could save the user time.