Juan will still hit some big homers for us before the year is out. That's my gut instinct and probably AA's as well.
That doesn't mean it's the best move to keep him either. On the other hand, AA knows September expansion will let him fill the roster as he likes, so Juan's spot on the team won't be so costly.
Despite what the naysayers might say, September will probably be legitimate for this team, dire though things may look.