absolutely bitcoin can only be used on electronic transactions, because bitcoin itself does not have a physical form such as now exist currency, bitcoin only convenient means used for electronic transactions,
electronic transactions have requirements include: must have internet connection, must have a PC or notebook, if all the above requirements are met, the use of new bitcoin can comfortably ...
Most fiat transactions are done electronically now. The world becomes more connected through the internet everyday. I don't see this being an issue unless there's a massive power outage, but at that point we will have much bigger problems on our hands.