Do you think its a good idea to have paper Cryptocurrency in circlelation too?
The answer is
NO.
Cryptocurrencies are by nature and definition digital and decentralized currencies. Turning it into paper cash would make it's purpose useless and require someone or some body to oversee the printing or generation of this currency, and that, is where greed and corruption could stem from. This is exactly what crypto is trying to combat in the first place.
Well it can be a good idea too since bitcoin becoming popularized and becoming more and more than we expected well sooner or later it will turn into a real life fiat or the paper money, which in that case will be a good idea for some, and the bitcoin we know will now be a noticable instead of anonymously.