You can't stop arbitrary data from being added to the blockchain. It's an age-old debate almost as old as bitcoin itself. What the devs can do is close the hole that allows for superlong taproot scripts in witness data.
this one could be monkeys vs no monkeys.
All pre-existing monkeys get grandfathered in to any sort of new fork unless you're including some kind of rollback to the pre-Taproot Wizards days, which makes things super complicated and let's face it, isn't gonna happen.
I understand this. But bitcoin has exposed a weakness which can stop blockchain. And if it can happen, it will for sure.