>demand is still there today
Not all demand the same. There are broadly 2 types of USD buyers
1. price insensitive: sovereign banks, who buys for liquidity/storage
2. price sensitive: hedge funds, private buyer who buys returns
Type 1 buyers are bailing out of treasury. Type 1 are marginal buyers, the close auction regardless or rate, this keeps rates low -> debt servicing low. They artificially depress yield to non market rates, without them rate go up because you have more price sensitive buyers who buy for returns. This increases borrowing costs, hence US debt repayment rising massively.
Type 1 buyers, i.e. US allies (and historically even adversaries) soaked up treasuries are now de-dollarizing / buying gold in lieu of _more_ USD. Type 1s underpin the "privilege" part of exorbitant privilege. The more they de-dollarize the more dollars become exorbitant, aka debt like everyone else. Type1, sovereign held 60% of USD to 40% in last 5 years. This large part of why interest tripled and debt servicing went from 350B to 1T in 5 years. Type1s exit to 20% in another 5 years and maybe interest goes to 5%, debt servicing 2T+. It's the difference between 10%/20%/30% debt servicing as % of federal revenue.
This not to mention USD reserve ticking down at 1% per year means meaningful changes in our lifetimes, and velocity may increase with developments like Saudi no longer locking oil to dollar. Less USD as % of global reserve = more network effects of alternate payment = increased potential velocity of USD reserve drop. This doesn't mean other currencies pickup all slack, i.e. central banks seem to be going in gold / commodities with no counter party risk for new storage. The net result is USD will still be around, in large volumes, but the cost/debt to sustain the system will be "normalized" while US budget is historically is built around USD debt being privileged. AKA difference between borrowing money from family vs payday loans.
>Nearly all commodities are still priced in USD
PRICED as in benchmarked in USD, but =/= USD is being spent to settle them. There's a fuckload of commodities where PRC alone buys 30/40/50%+ of global production, and while quoted in USD, increasingly settled in rmb/CIPS, bilateral currencies, BRI infra or other swaps mechanisms that bypasses USD. This one of the largest source of dedollarization - PRC went from single digit % to plurality of cross-border settlements in RMB/non USD. Though this is just very recent leading indicator that USD is functionally circumventable.