You can not roll back the Bitcoin blockchain and if Bitcoin community do this, Bitcoin blockchain will no longer be considered as better than Ethereum blockchain or many shit coin blockchains.
Each mining pools, nodes can have their settings to exclude transactions from Ordinals but if they want to do it. Miners get benefit from more expensive transaction fee, higher fee rate because they confirm transactions and get transaction fees.
Reason to roll back the Bitcoin blockchain?
It does not make sense because a Bitcoin block includes many transactions and transactions for Ordinals, BRC20 tokens are one of many in a block.
You're correct that the Bitcoin blockchain cannot be rolled back, as it operates on a principle of immutability. Rolling back the blockchain would undermine the trust and integrity of the network.
In terms of addressing the congestion caused by ORDI transactions, it is indeed possible for mining pools and individual nodes to implement settings that exclude or prioritize certain transactions. This can be done to mitigate the impact of ORDI on the network and prioritize other transactions.