All a bit blah I fear!
So Prior. Prior the grown up (as opposed to the slightly petulant Jack-the-lad of his first stint in the side) has been a superb cricketer for England and should continue to be for at least the next three/four seasons. Indeed, there would have been a very good argument for him, rather than Cook, to take the reins at the end of last Summer; he seems tactically to be a littel more astute than Cook, and the trend for captain's to lose their job upon retirement means that Cook will have either a long and pressurized stint or an unnecessarily curtailed test career as a result.
What England do need to think about is his role in the side; his body is starting to creak from the keeping and, at a point in the near future, it might be worth looking at Prior as a specialist batsman with one of the other young keepers coming through to take the gloves with him still in the side.
As for Gilchrist, thats a whole other debate. Did he change the perception of keepers toward being batsmen who wore gloves to field? I'm not convinced - I think the great West Indian sides had already done that with Derryck Murray and Jeff Dujon, who were front line batsmen who happened to keep rather than the best glovement available - thing is, with four big quicks, you didn't need a class keeper so much. And Gilly had the key advantage of batting almost exclusively against sides who had used two new balls and all their energy working through a combination of Slater, Hayden, Langer, the Waughs, Martyn, Clarke, Lehmann, Katich...