No, it isn't possible. The only way to disable it are the new ps3 with metloader 2, but probably they could also be downgraded in other way.
I think only new ps3 with metloader2 cannot be downgraded now (probably in the future you can do it). No, sony cannot patch all the consoles, I think no new firmware can stop the work of it.
I don't understand the utility of this new firmware, it does not bring any new feature.