How did it fail if first gold and now Bitcoin outperformed the USD through out history? That is the real metric. Yes, fiat is currently used more, but this won't last forever.
Discussion
How on earth are you measuring "performance" against the UoA, what prices are denominated in?
You're alternatively talking about asset price performance and adoption as money depending on what suits you.
Pick a lane.
No issue there, can compare value appreciation using any UoA. Price performance is just a measurement of value flowing into the asset. So far it has been going in one direction rapidly, the better Money Bitcoin.
sigh
nm bro, good luck to you.
to the reader
think about how you might measure the performance of an asset *against* the UoA that the asset's price is denominated in.