If I understand your idea "regulation" correctly in the sense of a kind of "pact" between distinct countries to refrain from restrictions and limitations to cryptocurrencies and to support its usage (e.g. accepting Bitcoin for taxes from merchants), then I could agree that this could become helpful to transform Bitcoin into a real "currency". I don't think it's really necessary though, I think it can also work without the governments' help.

Such an agreement could be made in the mark of an existing organization like the World Trade Organization. Even better though, it would be interesting if a "pro Bitcoin bloc" of Bitcoin-friendly countries could be created. Such a block could come with an own set of cryptocurrency-related international agreements, e.g. for consumer/investor/merchant protection and so on.

The big question is of course: The only really Bitcoin-friendly country so far is El Salvador, some other relatively friendly ones like Singapore aren't at the same level. Will the US for example join this club as Trump promised? What about European countries (Czech Republic for example)?