There is no way it will be possible to leave without cash at this level of financial development, the fact that the society is now moving towards cashless society it still very important we know about the relevance of faint paper money because it still remains the central currency accepted for all transactions. But if your project is aim at breaching the gap between faint and cryptocurrency then it will be a welcomed development.
There will be negative benefits and values from what will grow in the future because people still use paper money as a legitimate and very efficient tool rather than virtual money that they have not understood at all.