I think the bottom line is this - The debt that many students are incurring is a problem, and I think it may take some outside-the-box thinking to look at ways to rectify it. I don't think we can count on graduate schools to reduce their tuition, but if they required fewer courses prior to entering PT school, it might reduce the debt load, and I don't think it would negatively impact patient outcomes, or our standing (or lack thereof) within the Allied Health Professions community.
As long as students want to become physical therapists regardless of the costs, then tuition will continue to be a problem. No one is forcing these students to incur $150k+ of debt. That's why there is no downward pressure on tuition.
The only courses that should be required for admission to PT school is the pre-requisites (chemistry, statistics, biology, etc.) The pre-requisites might be 60 credits, but not 120 necessary for a four-year degree. I think the reason a four-year degree is necessary is to enhance the prestige of the profession. We're trying to become autonomous health care professionals and eliminating the four-year requirement would undermine our status. That's the argument. I don't accept it.