I don't think miners can do anything about this. In the worst case, they coordinate to stop mining on N-1 block. But this requires an amazing level of coordination, plus network can directly bribe/reward next block producer by paying to `coinbase` address (real `coinbase`, not Armstrong's coinbase).

> "The Merge" will introduce catastrophic bugs, 0-days will appear.

This is why you have testnets.

> we're in for a long and exciting ride.

Definitely!