Truthfully, how the rest of the world feels about imperial doesn't affect my players or group. We know imperial better than metric, and our point of references for them make sense to us in our group. For planetside missions, if I say "This is 10 miles away", they have a good mental image and understanding of the distance. The same isn't really true if I say "This is 16 km away". And trust me, I have tried it with HERO system, which uses metric. For combat, it was never a problem because we just counted the hexes. But whenever I would try and impress a distance or measurement on them in metric, I'd get questions on how heavy or hot or far the concept was. So for me it is just simpiler to stick with Imperial for my games. Even when I run Stars Without Number or Eclipse Phase, I run it in Imperial. It's just easier for me and my group to grok.