... or the company making this could say "they're going to buy this no matter how we do it" and release a wired guitar that uses nothing that wasn't in the PS2 or 360 versions of the game. You assume they'll just let you snap in a remote cause it would save money ... why do they care?
Activision is no stranger to the generic port. Maybe the Wii will get a Les Paul shaped guitar but I wouldn't count on anything revolutionary. The DS version is just a cash grab.