Agreed, firmware security by chip manufacturers has been underwhelming to say the least and we can blame them for that. But in this specific instance I still don’t see the benefit of a fix for consumer usage. Companies have a responsibility and accountability toward their users, so a fix is due, for personal laptops/PCs the threat is toward the owners themselves (activists, diplomats, journalists, etc.). The latter do not buy second hand equipment, and if the firmware is compromised while they own it, they are already in danger.
So if a large region (say europe, or USA + canada) is cloudy and without wind, then all transactions must stop and the remaining countries are susceptible to represent over 50% of the hashing capacity. A perfectly sound system I’m eager to see.