When the military finds a flaw in their immutable firmware, what do they do with those munitions? Throw them away and build new ones? Routers are networked and critical vulnerabilities that should be addressed get patched on them over time. Is the proposal to just tell the user to buy a new router?
Here is the same with the routers that got bricked. They probably need to be reflashed. Most likely they are leased by the ISP so under their scope of responsibility and maintenance.
"internet doesn't work" -> "send me a new router, it broke", problem solved.
