I'm not concerned that his health is poor, I'm concerned that his health is good.
MAGA is a cult of personality, there is no #2. He holds100% of the power. When he reaches room temperature, there will be a massive insider battle for control, but it will be for naught. NOBODY will follow anyone but HitlerPig himself.
Instead, MAGA will transition to a religious sect, and literally worship HitlerPig as a God, or at least as a prophet.
It has to be a stroke big enough to take out Vance and Johnson at the same time, and fuck up the chain of succession.