A comparison to M3 is much more appropriate than, say, total household wealth (see nostr:nevent1qqsqpvlqxgl97qwy0jl3vyruhtr6uy46ftu3p6zqetw4qy0t4e8g3sgpzpmhxue69uhkztnwdaejumr0dshsz9mhwden5te0v96xcctn9ehx7um5wghxcctwvshsz9nhwden5te0v4jx2m3wdehhxarj9ekxzmny9upzq6dm). It gives a ballpark but we can't be certain about the future valuations of people. I think his key point is right if we adjust for inflation. We cannot expect it to keep exploding in purchasing power forever. We can expect it to continue to have modest gains in purchasing power forever if it actually becomes money.
It doesn't look like Bitcoin is ready to take over for all the collapsing fiat monies supposing they collapse in the next few decades. We will most likely have several monies. I don't know what they all will be but perhaps something like gold, silver, Bitcoin, altcoins, and commonly used commodities.