Think about this from the physical perspective. Some (even Satosi) have said that bitcoin is a bit like digital gold.

Freezing quantum vulnerable coins basically means that, if you do the hard work and find a long time ago lost gold treasure, and then you don't get to keep it and it will be destroyed. That's quite insane.

We should use effort to develop more quantum safety measures and teach people how to use them, but freezing other people's coins just to "protect' them is not the way to go imo.