The atms are going to play a huge role in this.
Now getting a hold of some coin is trivial. Liquidity is going to improve substantially.
The promise of ZipZap CashCoin in the UK looks even simpler than ATMs.
Obviously, people need to be able to both buy AND spend bitcoin easily, for this to go mainstream. Also, perhaps worth noting the price of BTC won't be unaffected by merchants initially opting for immediate exchanging BTC to fiat; only later when merchants hold some coin and if investors look to BTC for longer term return, will we see a true stable value found.