Where "it" is Bitcoin and not USD.

But bitcoin needs to be transformed back into a currency at some point to use it. There is no point in a wire transfer if the person at the other end isn't going to use it.

Yes, some retailers accept bitcoin, most don't.

I always felt the dream with BTC was to trade without the need to convert back. That BTC be a competing but decentralized currency - in its own right.

Even those that do price in their local currency.

Looks like Bitcoin still hasn't achieved unit-of-account status yet, even among those who use it as a medium of exchange.

But the goal is to transfer USD across international borders...

Usually you need something other than USD on the other side of an international border. In which case, USD to BTC to XYZ is very likely to be cheaper than a wire transfer.

I've been doing it myself for years. You have to use limit orders on cheap exchanges (not brokers!) and sometimes wait for the spread to close but you can usually get it within 25 basis points of spot.

Then what about comparison to the cost of getting dollars into a country whose government is very hostile to them, like Venezuela?