In the foreseeable future, each developed country will create its own crypto currency, provided by the national currency.
I don't think so, every country will still using fiat money for their currency, and forever still using fiat money, I don't know why you really sure if every country wil make their own crypto?
How much can this contradict the very idea of Bitcoin as a free, decentralized system?
Need cryptocurrency state control?
[/quote]Control? I also don't think so, if crypto can controled my the country or anything, that will not named cryptocurrency, because like you know, the character of cryptocurrency is decentralized. And No more reason to control crypto in the world and that never be happen.