Has anyone seen or personally heard of someone yanking their laptop, of any brand or model, onto the floor via the power cable? I haven't. I instinctively think it's a risk, but reality says otherwise. It seems to me like a solution looking for a problem; the only reason I ever suspected that it's a real problem is that Apple made the Magsafe connectors - maybe they had some data that I didn't. Now I suspect it was all to address unfounded fears in consumers.
I've seen it happen plenty of times with cell phones, however. I wouldn't mind a Magsafe connector for an iPhone.