We want so badly for bitcoin to be accepted in stores and such, but has anyone thought of this before? What's going to happen once everyone is using bitcoin?
Technically Bitcoin is not ready for such number of transactions, but good news is number of transactions does increase much slower than Bitcoin price, so a lot of time to work on this issue (hopefully).
Yep. There are a few technological issues to overcome. Luckily there are some incredibly smart people working on them as we speak.