Great observation by the OP. I think a major shift will happen to Rondo next year, and it will require a personal adjustment on his part. He's show he can be a competent PG in 2008. He showed he can be a big time player in 2010.
But now he starts getting the big boy paychecks. He's not there to complement the rest of the starters now. He himself is now expected to win games for the team. It shouldn't be about who he plays next to or how much the aged roster has declined, it should be about how Rondo will make them look 29 again by making the players around him better. PP, Ray, and KG made Rondo look pretty good in 08. It's his turn now.
Ray, Paul, and KG aren't carrying the team. Heck, they can barely get their own shot anymore, at least not as good a look as they may have in the past (PP getting to the rim lately? Pull-up and step-back jumpers, most likely.). It's not on them, it's on Rondo, so...yes, it doesn't matter who the wings are as much, or whether we'll be able to get a great player.
It's Rondo's job to make whomever ends up out there look great.