Can Bitcoin replace the role of paper money in the future?
TBH, I don't believe bitcoin will be substitute for paper money, maybe if the government accept and legalize bitcoin, it could be.
although bitcoin has potential become substitute for paper money,
So let's see at the next several years again.
And in a few years, and in a few decades, and maybe more, the situation with cryptocurrency and paper money will not change. The fact is that these are completely different financial assets and they do not directly affect each other. Bitcoin and other cryptocurrencies cannot even theoretically displace cash. Cash is entirely dependent on the actions of the state and their authorized bodies. In some cases, they are the simplest and most reliable method of payment and do not depend on the availability of any technical means and the Internet.
I agree with you, cryptocurrency will never replace paper money, cryptocurrency - basically now acts as a speculative component, but in no way for our everyday transactions or purchases in supermarkets, it cannot be regulated by 100%, so it will never replace paper money, especially in in the nearest future. It will always remain as an alternative to paper money.