That's an interesting idea about the U.K. adopting Schuko receptacles but including a fuse at each outlet to enable the ring circuit to be retained. It would certainly enable a changeover to be made without the need for complete rewires.
I wonder though, whether after a short time there might not be a call for the U.K. to switch to Schuko outlets on 16A radial circuits, Continental style. If that did happen, then there would be no point in using fused receptacles on those new circuits, so we'd have both fused and unfused Schukos being sold. And when Joe Klutz decides to convert his own home, you can bet which type he would use to replace his existing BS1363 typoes, can't you? The unfused types are bound to be cheaper, after all.
That aside, the biggest hurdle to overcome would be to get the IEE and other British Standards bodies to accept the Schuko receptacle. Even though for most appliances polarity doesn't really matter, they are still totally opposed to non-polarized connectors.
