Agreed, while it may be hard to speculate which country will make crypto, and particularly, BTC legal tender next, countries from the underdeveloped regions will have more of a reason (and probably find it easier) to get this going.

Perhaps, it will be a matter of months to see how El Salvador will do as a test but I can see this legalisation extending over time. Not sure which country exactly will be next but it will be an interesting turn.