Link has been the solo hero but in games like
OoT you see several Hyrulian soldiers and I've even been given the impression that Hyrule is no push-over kingdom. I'd love to see a game where Link is almost a mere mercenary amongst an armies of allies and foes where he runs around and does his thing WHILE great battles are being fought...and then the option to choose to help fight in those battles...including some you can't win and have to retreat.
Link might not beable to take down armies of foes on his own, but he's definately a heavy weight to help tip the scales. A system where Link is "just" a big piece to a much larger puzzle would be incredible IMHO, where you have to pick and choose what battles to fight, where you might want to hold your ground and know when you need to flee and regroup later. Battles where you are needed most or not needed at all ontop of side missions and dungeons...yummy