I really think that CEE 7/7 should adopt that system as the standard socket, instead of traditional reversible schuko CEE 7/4.

Just enforce strict polarisation.

You could phase the side-earthed schuko sockets out of use very painlessly and end up with a polarised system.

For non-grounded appliances requiring polarised connections

[Linked Image from upload.wikimedia.org]

Solves all problems when used with the French sockets.