I think it would have its uses. In particular, infantry would be useful for the islands that are protected from the scrambler that limits computer-controlled craft. Also, like in most RTS games, limiting the capture of firewalls, research etc... to infantry only, would then allow for infantry to play a more pertinent role within the game.
Whilst it doesn't fit within the model of Carrier Command, the parts where you play in first person - walking around a carrier, or disabling a shield generator behind enemy lines, added another element to the game for me; hard to describe but the environment suddenly felt more "real". Would love to see something like that implemented in the future.