Rollback Taproot? That means invalidate/remove all blocks since Taproot activation which occur about 6 months ago. If that actually happens, Bitcoin might as well as die or abandoned. Furthermore, it's possible to re-create Ordinal/BRC-20 standard without Taproot.
I believe something will be done.
A few hundreds of people cannot flood the network like this with a malicious script (and the ordinals can be used like this).
Imagine if Faketoshi (or some other authority) wants to flood the network, making bitcoin unusable.
In my opinion, this is already a security problem. Similar to a DDOS attack.