If all paper money were change into Bitcoins, can it be access and use by everyone? how can the beggars access Bitcoin?
yes that's the constraint, so bitcoin will not replace the paper money, one of the factors is the state of potential users there are not able and some who do not know how to use it, there are still many human resources that are not ready with payment method like this, still it will be a long time to get ready to use bitcoin