For me, the way we could still make it possible is to establish a local exchange wherein, if we convert our money to crypto, these local exchange could already have the portion intended for the tax of each transactions.
you mean they should implement a tax on
buying BTC, at the time of purchase? i reckon a thriving market for OTC brokers and p2p trading would develop to avoid those taxes.
there would need to be rules that allow capital losses to offset tax liability. otherwise people who buy (and pay tax) before a market decline are getting doubly screwed.