If the state prohibits the existence of this bitcoin it will narrow the bitcoin space. Bitcoin can not develop well in that country. And bitcoin is very good and profitable for those who know it.
I would rather bitcoin is set by a country. All consumers will be more secure, because there are parties that protect consumers.
If bitcoins are free throughout the country, what I fear is the game for rich people and bitcoin abusers in negative or criminal matters.
Bitcoin can still continue to develop even if some countries restricts it because bitcoin is not only dependent to one country or on a single person. Bitcoin is fully independent which means it can work thru its own . However it still needs some support because that is the only way it can increase its value. we cant really anticipate the future because cryptocurrency are really unpredictable.
Countries who are banning bitcoin wanna grow their own coin, Example: China has NEO.
Bitcoin will be very useful in the future is the best coin at the moment and the experts are seeing that bitcoin will be very high in the next few years.
China didnt ban bitcoin but rather the ico and some online exchanges only because they think these can cause too much fraud . and also there are many countries and companies that also develops their own coin but they arent really threatened to bitcoin.