General Blue died though, Colonel Silver might have survived, his faith is uncertain. Could also have been interesting if he had returned during the android saga. Heck, they could have had him as an android instead of android 19. That would have been pretty cool, especially since then he'd be the one to beat up a sick Goku.
Sadly few things of Dragonball ever get to make a come back. Not even Launch got to return, I kind of wished they'd bring her back with Super. She was a great character.