This is the danger of the Part D cliff in 2030. Biden & Dems created crisis point, which will then be used not to fix the damage from the IRA, but as an excuse to fold it in to traditional Medicare. The whole point is to hammer the wedge in further, until you get M4A.
Here's how we get Medicare for All done:
Make Medicare whole (no one can keep all the parts straight!)
Include vision, dental, and hearing.
Begin extending to more people, starting with children.
We arrive at Medicare for All, which means great Medicare for everyone.