I think you should, especially if you're designing something that emphasizes on privacy. We're moving towards a more oppressive regime, all of us in Europe, no doubt.
Is that even possible? Do you have any reference to support this being in the "agenda"?
There's indeed tendency to repeal cash, and switch to completely digital money. I don't know what kind of reference you want, though. One where Lagarde makes such tremendous statement?
banks are already starting to refuse transactions.
after 2025 BTC , ETH and so on will be worth real 0.
Seriously, that's your conclusion? You haven't understood bitcoin well, buddy.