What I'm taking about is stopping the ability of transaction getting erased from a ledger, when EVERYONE KNOWS THE TRANSACTION happened.
That's already how it works. What it depends on is which ledger you are referring to. Do you get what I mean?
For example we could use credibility in the human nature economics department, where at a coin launch they simply say "NonDisappearingCoin will have no roll backs". If they did have rollbacks they'd lose brand and credibility and be something other than NonDisappearingCoin. Maybe there can be help from the tech solutions too. I don't know but I'm not giving up till I have irreversible transactions.
Fair enough, but then you'll still face the usual problems around this issue. I can still fork the blockchain, convince all my friends that we should use this one, and the staff at "NonDisappearingCoin" will have zero recourse against us if we manage to build enough consensus around us.