Would you want the Firmament to be a feature for future expansions?

[Amnmaat]

When supply vastly overwhelms demand, there's no profit to be made.

Not true, you're acting as if the market is not growing? The more and more patches we get the more unique things there are to craft. Sure, you might not be making as much as before but that's balanced out with the lower expense of "living" that comes with deflation.
Furthermore, you can still make a healthy amount by finding your niche. You just want to be the grandmaster crafter whom the peasants sell their kidney to buy from. When you could be making similar money or a little bit less by adapting and finding your niche. It's ok to adapt, you don't need a system rigged in your favor.