The powder and other component related manufactures would be foolish to invest in high cost infrastructure to meet current demand with no way of knowing when the market will become saturated.
If an entire batch of production is going out the door and getting sold rapidly and at an advantageous price.... what is the problem again? There is some risk of people finding an alternative powder but with the mass of reloading information for say 2400 they can be pretty sure people looking for load information for a caliber are going to get steered toward one of the "dependable" powders that many have written about. Too many already have pet loads for Red Dot, or Unique, or BE or.... so even if a few switch brands all those pet loads are already published ready to pull in some reloader who goes looking for a new load.