Another counterpoint: Can women's racing support itself in the absence of men's racing? Can men's racing support itself in the absence of women's racing?Counterpoint: you should have been faster to get into the prize money. See how this line of argument works?
Support women's racing. It's the right thing to do. The problem you outline doesn't have anything to do with equal prize/contract money for women. Though we seem to be moving beyond this, there was a period where elite female racers were encouraged to make revealing social media posts and keep their relationship status private, and so on. As a former pro, I'm sure you experienced that pressure as well, right?
What's a pro doing worried about field sizes and entry fees, anyway?
If the point of a riders union is to advocate for/ensure safe and reasonable courses for riders, this has been done in other sports without a riders union. I could see a lot of layout features that could go (and SHOULD go) in observation of that.
Think their list of grievances are best dealt with one at a time. A mob is almost never effective at multi-tasking.