Am 08.07.2015 um 14:32 schrieb Magnus Manske:
Silly question: Why not leave the system as it is (allowing for non-unique aliases), but do some (reasonable) cleanup, then warn Wikipedia editors when they use a non-unique alias? Like using references without the {{reflist}}?
If aliases are not unique, you cannot use them to refer to properties. If you cannot refer to properties by alias, then you cannot change the labels of properties without breaking all usages.