I agree with Just...Robben needs to start doing it consistently.
Without doubt, he's our biggest "creative", attacking threat (and by creative, I mean more in the "creating" sense than in the "wonderful myriad of solutions" sense for he's quite the one trick pony). Having him on the pitch and not having him on the pitch makes one heck of a difference, and in that respect I'd be pretty distraught to see him leave. But consistency is not part of his game right now, and injuries aside, he needs to begin putting performances together on a consistent basis. He is a really important part of our team.
I'm in two minds about his defensive responsibilities though. Considering how easily injured he is, I tend to get really worried when I see him attempt to put in a challenge. Joe Cole was able to beef up considerably, but then speed is not his most important asset. I don't know how such an approach would affect Robben's game.
If Robben can regain match sharpness AND keep fit for the rest of the season, he WILL be an important part of our drive for success though; of that I am certain.
I'm getting a little tired of the "choker" formation myself.
Cheers,
Butch