The huge increase in new gun owners/ammo buyers, coupled with the largest ammunition manufacturer (Remington) going bankrupt, created the perfect storm for an ammo and components shortage. With Remington now back in production, not sure if they are at full capacity yet, the strain on the system should start to ease a little. None of the manufacturers are going to build new plants because of this shortage. That would not be a prudent business move. But they are running 24/7 in the existing facilities to try and meet as much of the demand as possible.
It will take awhile to get back to some semblance of normal. If the new administration starts really pushing their stupidity, it will take a long time to get back to normal.
In the meantime, I have seen good people willing to trade/sell their surplus without gouging their fellow shooters. Forums like this have been good in that regard. Suppliers are filling orders as fast as they can. Took 4 weeks, but I did receive an order of 45-70 brass a couple weeks ago. I'm trading one of my son's friends some small & large pistol primers for some large rifle magnum; win-win for both of us.
Patience. This too shall pass.