a) Yes, likes of Circle and are solving this with USD balances and instant conversion to btc, also bitcoin has not been that volatile in last year b) Coinbase

a) Yes, likes of Circle and are solving this with USD balances and instant conversion to btc, also bitcoin has not been that volatile in last year b) Coinbase a YC company and Circle mentioned already are doing great job on this end c) Since bitcoin is basically digital equivalent of cash thats like asking for wings on a car. As for security I have a hardware Trezor wallet on my desk which keeps keys secure even if my computer is infected. You see problems, I see opportunities for startups The early internet had many problems, those companies that solved these problems are now household names.