Nope. A true cryptocurrency should never have a capital.
Bitcoin and cryptos don't need capitals, they are built to be free, like a bird in the sky, like a cow on the hills, like women in the kitchens.
Why not? What's wrong with a city embracing bitcoin and having enough merchants and services to be considered the (unofficial of course) capital of bitcoin? I would love a place like that. Some where you can go and know that you can support your self just on bitcoin.