I don't think that there are even 10 people with all their money in bitcoin.
It doesn't matter how much savings you hold in bitcoin. If you decide to limit your savings in BTC to 1% of all your fortune, fine. Now you can purchase a few more BTC for payments and then actually spend them.
The argument was that nobody would spend bitcoins, because they go up in price. This argument contradicts to the idea of limited savings.
Please quote all the discussion , not what part you want.
You proposed a scenario:
"If bitcoin users have all their cash in BTC they will have to spend it some time."
I told you that is a SF one.
Nothing more nothing less.