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Sure, BTC exists, and governments have an interest in keeping it going since there is great traceability, but a digital currency that you can use everyday and everywhere to but a Coke is probably still a ways out.

"currency" is measured in "market cap" now?

Not just currencies but also countries... That naming scheme is very lazy.

Shouldn't every currency have a theoretical market cap relative to another currency?

If there are 1 billion Thai Baht and 1 baht trades for 1.0 USD, then the Baht should have a 1B USD market cap in theory.

Why is that list missing gold?

The list is bunk, BTC is like gold, an asset, not a currency in the common parlance.