That would be a terrible reason to unionize.

Let developers race to the bottom for bottom-feeder work. It's no concern of yours, since that's not the sort of work you want.

You're a professional, and will deliver high-quality work in exchange for a premium rate. There are plenty of clients out there who are willing to pay for things to be done right.

All that unionizing would accomplish is dragging you and me down into that pit you describe. I'll thank you to refrain from doing so.