Sure, comparing and old physical asset that deprecate over time with a pure digital asset built on a blockchain makes a lot of sense. Currencies are way easier to trade than physical goods.
Everything is a question of supply and demand, it does not mean it's valid to compare every goods to another on the market.
The Bitcoin you hold is exactly the same as the Bitcoin the GP holds.
The 1996 Toyota you hold is very different to the 1996 Toyota I hold. The goods are not interchangeable. They are not commodities.
Only 2.1 million 1996 Toyota Corolla VINs were ever minted; there will never be another. If 10% of the world assets were held as Toyota Corolla VINs, that would give us a value target for a VIN of about 14 million dollars per VIN; I think with those assumptions it's quite reasonable to value a Toyota Corolla at 1 million USD, regardless of condition.
Bitcoin having any value is absolutely a shared delusion. But it at least has other properties that differentiate it from other shared delusions.