It doesn't make a difference whether a currency is paper or digital - if digital currency takes over in your country, the exact same thing will happen. The government will regulate its use, punish those using crypto 'unlawfully', and print more when it needs to, making it lose value.

See, it doesn't matter what the technology behind a currency is, it ain't going anywhere on your government's turf without permission. They have the ability, if they choose, to go door to door looking for 'unlawful money launderers' or any other designation they slap on the use of crypto and there's nothing you can do about it.