Infrastructure is really a big word. I think it would be more apt to say that some user does not have access to use bitcoin.

Bitcoin resides online on the internet should one wish to make use of it. Bitcoin being digital in nature requires a user to have an internet connection. But nowadays, there are only few places that remains out of reach by internet service providers. So in totality, internet to access bitcoin is not an issue.

The lack of knowledge regarding bitcoin is not really the issue here, rather, the inability to comprehend the whats and the hows of bitcoin is the major challenge. Truth in fact, setting up bitcoin wallets is as easy as 1-2-3 for grade five students.

Thus, i do believe that you can use bitcoin as a practical currency, provided that you exert a bit more effort unto that.