Bitcoin value can be measured against the current fiat system in terms of percentage (ie is it going from being worth 1% of broad money supply to 5%?), can be measured against gold, etc.
And then more directly can be measured in terms of ecosystem. How does UX look compared to 3 years, 5 years, 10 years ago? How many bitcoin hubs do we have today compared to 3 years, 5 years, and 10 years ago? Like Bitcoin Beach, Bitcoin Jungle, Bitcoin Ekasi, a recurring Indonesian bitcoin conference, a recurring Ghana bitcoin conference, etc.
Happy to come back on the podcast sometime. :)