I got the 6 million from this link: https://www.chemanalyst.com/industry-report/helium-gas-market-578
The issue is not how much can be produced right now, but the rate at which we are depleting it.
I found different estimates on how long earth’s helium supply will last, and most of them are between 10 and 100 years. That’s not a long time, considering that it means we will lose access to a whole element.
That would indeed be very helpful. But if all the other usages keep draining the supply, it will only help extend artificial reserves.