What ever the number is it needs to be more.

According to this article there are around 52 million "every day" millionaires in the US worth between $1-5M. It should be trivially easy for these people to own and self custody one bitcoin (except of course the obvious 21M BTC reason).

We need more easy to use self custody wallets like Unchained, Casa, AnchorWatch, Proton, Bitkey, Liana, Sparrow, etc. Bring on all the projects with what ever models/trade-offs work to somehow put the keys in users hands.