They started to accept it. It is not an easy job for them. If you want to make a good job and maintain the system in your country you need regulations. And regulating cryptocurrency is not at all. And we have other factors like rich corrupted people that don't want to share their power with no one.
when bitcoin is legal it means there is a habit that they continue to use bitcoin with a large enough user capacity when it happens then the fate of conventional money will be questioned because the majority of the population uses bitcoin as a means of transaction.
I think it will automatically change but major currency changes do not need a legality or recognition from the government, because when everyone uses bitcoin then bitcoin will become mainstream, of course there will be lots of stores and merchants that accept payments with bitcoin and automatically many people use bitcoins for their daily currency..