Some fair points, Bamaga Man--I think Kuyt does have more goals in him and I hope we start to see more of that from him as he settles. I think this issue of him settling is important. Because he is a workhorse and a endeared himself to the supporters from day one I think it's easy to forget that he's still getting aclimatized to the league. I expect we'll see more of what he's capable of in front of goal toward the end of the season and into next season, particularly as his strike partners and the midfield work out his movement and runs.
But, I think it's also important to recognize that he's not been asked (presumably) to be the fox-in-the-box striker or the guy who plays off the last defender. I think he's more of the classic #10...the link between midfield and attack--the one who creates chances for the likes of Stevie and his strike partners (as with the knock-down for Bellamy which led to Crouch's first on Saturday). You mentioned RVN but I think he's more in the mould of Denis Bergkamp (although not quite on that level). Sure, Bergkamp could score some lovely goals but he was more about linking play and spotting the passes that unlocked defenses and set up his teammates. That's where Kuyt will shine for us.
As for rotation, I agree that he could be rotated more to give our team some "different options." I'd be inclined to swap him and Crouch every so often, partnering Bellamy or Fowler. It does seem, though, as though he's Rafa's first choice (more evidence that he's doing the job that Rafa gave to him).