You know what really needs to make a comeback? The jetpacks in the Planet Moon games. There was the hang glider thing in MDK, the Mecc jetpack in Giants: Citizen Kabuto, and the booseter/glider thing in Armed & Dangerous. They were severely underused in all three games, even though they were more fun than a barrel of monkeys. A game making constant and thorough use of this game mechanic would very likely not be the best game ever, but it would be pretty kickass.