I'm mixed on the thought. Naka always seemed a little bent on "make Sonic as cool as you possibly can", "give him a human love interest" and other out-there concepts, so someone would probably have to watch over his shoulder and tell him no now and then. Buuut ultimately if he were to ever return, we'd probably get games with less complex controls and more mechanical depth again, which would be very nice. I've always liked his philosophy to use as little buttons as possible, even if it had mixed results. It leaned itself in favor of that really arcadey 'classic Sega / Sonic Team' mindset. He's probably enjoying his current time at Squeenix though, so I'd rather him enjoy himself doing original ideas lol.