Personally, I've tried five times to make small purchases with Bitcoin (this was several years ago). In all cases I was ripped off and never received product. It's not going to be government regulations that kill Bitcoin, its the associations with illicit drugs, child pornography, and dishonesty of vendors like Robocoin.
It seems to me though, that due to bitcoin's relative newness and grey market status, you're going to see a lot of scammers and bad businessmen related to it. It's high risk in that sense, and you need to do your research. Give it time, and the bad business practices will be weeded out, and stability will come. This is the pain of early adoption.