Many in the Legislature acknowledge it will never be a true ‘single-payer’ plan due to your points. Additionally, Federal law prohibits states from treating retired state employees more favorably than retired federal employees. VT is a small state - all those who’ll be paying for this mess could easily transfer residency to NY, NH or elsewhere while continuing to live in VT.
Older Vermonters (the people with money) already claim Florida residency, for tax reasons, even if they are only there for a few months.