If, in the near future, the powers that be in the EU say 'Sorry guys, we want you to harmonise with rest of the EU, so the square pin plug has to go!'.
Though whatever round pin system you picked to replace it had to take the 2.5 amp europlug as a minimum, What CEE 7 based or related earthed/3 pin system would you pick?
Personally I would go for the French UTE plug/socket style, at least it is polarised when the grounded plug is used.
(P.S. it's a given that circuits would have to be radial).