I'm all for some universal system. inches to feet, then cm to inches, etc... The universal system is in Celsius, metres (and I'm spelling it the way one is supposed to), kgs, litres etc....only North America seems to be stuck on to the FPS system
But even in America the engineering courses used both systems.
The thing that bothers me is figuring out serve speeds, I just have no feeling what a 220km/hr serve speed is. But tell me 136 m/hr is and I know right away.