First we'd need persistent long-term battle campaigns, where you could jump into the action in any vehicle you have. Planes or ground armor. Ship battles are now done with missiles and planes, so i don't think we'd see ww2-style broadside gun action. It would be great to manage a fleet, then jump into a hornet and fly a mission yourself. I think that's the most exciting part of naval warfare. Or just let AI to do the management.
So one part of the game would play like a strategy, if you want to, or let AI to do the strategy and you just fly/drive the missions AI or your MP commander prescribes you.