Why would it need a country? Bitcoin was designed to operate without leaders, without centralized organizations to govern or support it. If you will make Bitcoin reliant on a country, you would only weaken it, because the country could be sanctioned or invaded.
Bitcoin only needs one thing - more users. And to get more users it should become less volatile and make some technical improvements.
While your argument is true, as things are now, bitcoin users are highly dependent on regulations. You can declare yourself to be "decentralised", but you would still need to abide by the regulations of the place you live in. Having a place where like-minded people share your values may help that vision become true.
The idea is to make sure that those regulations are aligned with your values and ideas. I can tell that many people on this forum are unhappy about the treatment that bitcoin has in term of taxes and restriction. Those that have a significant amount may be interested in living in a crypto friendly jurisdiction and that is simply not possible in many countries. These people could potentially benefit from creating their own jurisdiction, based on the principles of self-sovereignty, crypto friendliness,...
I don't know if it's going to be a good idea, plus you'll probably have to deal with economics, politics, natural resources, and other stuff that a country must have. Also, it's not really a good thing because bitcoin is supposed to be decentralized and having it's own country will defeat the purpose of decentralization.
To be honest, the first thing you would need to deal with is diplomacy, internal law and order and defence. However, as I said, this would be initially intended for individuals who are willing to create a state that would better serve their views.