But it is done. It is what we have at the moment, not what was centuries ago, not what was yesterday, it is what we have now. And the choice is not between good and bad, the choice is between bad and even worse. And system rollback is what even worse. Of course we know that some other projects easily done that, and why not to use those projects if to agree with that? Because that is what making those projects not the bitcoin. If anything can be undone than everything can be undone.

So I understand what you say. I understand that we've got a problem we haven't escaped. If there was a way to return to the past and not to do so, I 'd prefer that way. But it is impossible. And, as I see it, a discussed rollback is much worse than the problem we face with.