Man that blows. It's bad enough driving with a dodgy rear view mirror, much less without one. My old car's driver side mirror had been replaced and it was some terrible orange mirror thing that refracted a zillion reflections whenever it got wet and even worse at night, so it was essentially useless. Thankfully the other two were fine. I don't miss having to pay for repairs on my car now that I don't have one anymore XD
What's really sad is, this was a new car when I got it a few years ago. It no longer looks new. It's got a big ghetto crack in the windshield, is minus a mirror, and has a dented in front license plate (which I swear I don't remember how that one even happened.)
I don't think it would have helped, as the mirror would have been knocked outwards instead of folding inwards because it was the left side of the car that got hit. But steel mirrors... I want them. Maybe with spikes.