I would say that it has made the case for it based on how many people have used it to exchange value internationally, trustlessly, at a very low cost.

Additionally, Bitcoin network is backed by its ability to detect and refuse counterfeit coins.

You can do most of the above with Visa or Venmo as well, however you run the risk of tax reporting, transaction reversal, fraud, negligence, changing fees...

When Visa works, it works well. But when it fails, it fails in quite bad ways that Bitcoin does not.