Kuyt has shown many times that he can still get the job done. Kuyt figured in the team that humiliated Real madrid, Man u and Aston villa and even this season he sealed the FA cup win against Man u and gave a stand out performance in the Carling cup victory. I would definitely keep the guy and play him in place of Henderson.
But that's the point. We sign a new RM. Henderson and Kuyt won't be needed there then. Backups are Bellamy and Downing.
It's no secret we need another wide player of some quality, and Kuyt and Henderson are not that player. We could retain Kuyt as a backup striker, but again we have Bellamy and hopefully someone from the youth side will get a game or two, once more making Kuyt surplus to requirements.