> it's still going to be the currency a bunch of guys with guns insist Americans pay taxes in

Well, yeah, most currencies are defacto backed by military force. That fact creates bad incentives.

Crypto doesn't have this luxury, it can be only be backed by the trust in code. If the currency is trusted - because it's open-source, open for all to use, is well designed - it's value is going to go up. See Bitcoin and Ethereum as best examples of this.

This make a decision whether to use a particular coin similar to choosing Python vs JVM and their ecosystems.

To be fair, I don't think stablecoins work well in that context. The information on how they are backed is not completely public, the companies issuing stablecoins are not that well audited...They are blobs of closed-source "stuff" that look like 1$