Bitcoin, in my opinons has had it up and downs, but who supplies us bitcoin? Faucets can only supply so much before it gets closed down. So that's not a big supplier. Working for bitcoin has declined. I used to make videos and earn bitcoins. But that site has closed down like every other sites or faucets. So who supplies us bitcoins nowadays? Tell us please!
If you are asking about to whom we still gonna get bitcoin in exchange of work then from the people who already has bitcoin, if they have it then they can give it because you can't give a thing that you don't have.
Miners do mine and get bitcoins from transaction fees but the main factor of this transactions is the traders who trade in crypto market and the people who uses bitcoin to buy goods and different kind of services and by this bitcoin is circulating and earn.