- Is the metric system superior to the American (bastard) imperial system ?
- Is it worth the switch ?
There are a lot of other accidental situations out there that are (perceived to be) too costly to eradicate. For example, in Europe (not the UK) we drive on the right hand side while yielding the right of way to the right as well. For safety reasons, it would have been better to switch on of the two to the left. Will it happen? probably not.
Actually, cost might even be irrelevant: The Chinese still use chop-sticks while a fork is clearly more practical.