Remember that you’d have to get at least 38 state legislatures to ratify it as well. Getting any amendments passed in the modern day is a whole circus in and of itself, and I highly doubt there’s enough political capital to get such an obviously targeted amendment (since the candidate in question would’ve had to have two nonconsecutive terms - meaning this applies to Grocer Cleveland and Donald Trump) passed.
And the general distrust of the medical community that RFK preys upon. Don’t forget she also helped publicize, and likely contributed victims indirectly to, John of God, a rapist cult leader who (by some estimates) raped THOUSANDS of women and girls.