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.
Maybe, but rollback shouldn't be option any Bitcoiner (who value immutability property of Bitcoin) consider.
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.
Flooding Bitcoin network always has been possible though, even without Taproot. The difference is Ordinals, BRC-20, ORC-20 and other thing give financial incentive to make people do such thing, without even thinking their action may flood BTC network.
That depends on people's definition about smart contract. Some people define smart contract as turing complete scripting/programming.
That is a subcategory of smart contracts and this definition was popularized after the introduction of Ethereum. Otherwise ever since 1990s a smart contract is technically a program or a protocol that can be executed automatically without human intervention, trusted third parties, etc.
The best and simplest example of a smart contract is the
vending machines which is the oldest implementation of them too.
Thanks for reminder, it's piece of history i forget. But it doesn't change fact people these days is more familiar with definition introduced by ETH/ETH community.