You're implying that a TD is a failure if they don't have sufficient turnout? With that perspective, maybe TDs should have the right to cancel an event if not enough players sign up by maybe 10 days before the event? Only 50% refund for the players who pre-reged to help the TD cover sanctioning and other pre-event expenses fees so the players share the TDs risk. Would that be more fair? Despite the fact that you wish to make TDs into small business operators who take business risks, the reality is that most TDs are still breaking even or losing money and that's before counting their time and the time of other volunteers because they like doing it for the players.
If you wish to change to running C-tiers under some as yet to be redefined policy, that's still in the best interest of the players so go for it. However, I suspect there will be a few more TDs risking B-tiers in developing areas to make up for it and happier TDs overall knowing the PDGA has their backs perhaps a little more than before.
Rater of the tossed arc.