It's not safe to keep cash on a large scale because the government is always making new banknotes and the thing to fear is that the banknotes you keep will be withdrawn from circulation and that will expose yourself. for the next few decades, people will definitely continue to use paper money because the government also recommends that, but the use of digital money will shift the dominance of paper money.
For this I agree, because it is clear that the use of digital money is increasingly dominating in some circles of society at this time even though paper money is still used, but its use is starting to look minimal for urban communities.
This indicates that the use of digital money is starting to increase in big cities and those who still use paper money, most of them are rural people who currently have not experienced infrastructure such as ATM machines and the like. So they often still use banknotes in cash and haven't used any credit cards or debit cards until now.