I think the problem is going to take care of itself over time... some countries do an official changeover, others change gradually like Italy... I guess in the end that'll leave the UK and Ireland the only countries without CEE 7/7 plugs. Countries worrying about polarization adopt the Frnch style, the others Schuko, plugs are designed for both sockets and everybody is happy.
The Schuko plug was deliberately designed to plug into ungrounded sockets - the idea being, reducing a Class I appliance to a class 0 in a class 0 environment does not pose any increased danger while using a class 0 appliance in an environment with grounded metal surfaces present does.
The only real problem were the old Danish receptacles that accepted Schuko plugs but did not ground them and they're being phased out right now.
Stop dreaming of getting the entire EU or even the world to standardize on one plug by force... I'd be glad already if we ended up with all 110/120V countries using NEMA patterns and all 220/230V countries using either CEE 7/ or AS/NZ plugs.
