This is a fair point. The only note here is that the "enforced stop" as you put it is a function of the wheel diamter. If you think about making a wheel "non-round", its a function of the surface hardness of the wheel (ability to deofrm) and the relative size. so a 1/2 inch rock is just so much more likely to hurt a 2inch or whatever wheel than a 17/21/26 or whatever (would be like hitting a 6-8inch piece of concrete).

The frequency of this hazaard is more the problem. I skated in college to work all the time, but had the benefit of clean/smooth/concrete. It was a great mode of transit, for that. Who knows maybe someday the will have such lanes for these things?

& Obviously, the enforced stop scenario sucks on bike. Think, NYC taxi-cab doors, and etc. So thats fair.