The problem there is that metric basically equates to math at the end of the day, I don't think those are directly comparable. It would be very strange (and new) to have one and only one implementation of an entire class of software, instead of a technical standard with multiple different implementations.
Not when we can a have a logic stable and well made standard. Like the metric system. I am pretty sure that I would have a problem with any alternative to the metric system. The more we are to use it the better it become.
Evolution can and thrive through cooperation and mutual aid. I would be fine with having one standard implementation of a browser engine if it was not rule by a greedy corporate like Google, Apple or Microsoft.