Edit: PLEASE READ I need to clarify this. By roll-back ordinals I didn't mean to actually roll back the bitcoin blockchain. Just to prevent the ability for them to be created from now on.
Well, I have already suggested that a few months ago, and actually the answers I got were that it's not really possible to do that because it is a feature embedded in Taproot and it is even possible to make ordinal-like tokens without Taproot (e.g. using OP_RETURN). However, you can patch your node's source code with the
Ordisrespector patch to reject all Ordinals transactions.