Capital means that all important things are gathered in one place, which implies centralization and control, while the most important aspects of Bitcoin are decentralization and privacy.
Capital simply means THE city of what ever it is. Paris is the city of love, does this mean love is centralized in Paris? A capital of Cryptocurrencies means simply the city where you can get the most out of Cryptocurrencies. Paying in Bitcoin any where you want, businesses being generally supportive of Cryptocurrencies et cetera. From this simple idea to centralization and, like some people before me wrote, calling it the capital is violating the consent of Satoshi is an extremely long way.
I respect your point of view, but each person has their own concept or perspective. Your point of view is certainly acceptable as long as it doesn't violate decentralization. However calling it "Bitcoin City," for example, would be more appropriate in my opinion. For me, the term "Bitcoin Capital" is inappropriate, at least from a psychological or emotional standpoint, because I don't like Bitcoin to be associated with a city, country, entity or person.
I suggest that the title "Bitcoin Capital" be given to a city each year, similar to "Capital of Culture," where European cities are chosen each year as capitals of culture. This would be much better and more appropriate for decentralization.