The softfork proposal as I see it, (not finalized yet in code) is to limit the amount of data per transaction.
There is no “committee” or judge that decides which transactions are ok or not- other than the consensus rules of the network itself.
These consensus rules are why Bitcoin has value, if someone (like Peter Todd did) proposed to increase the 21 million cap- would the network accept it?
If someone proposes segwit? Or taproot? Or limiting the total amount of data per transaction?
We will see.
Keep in mind the UASF during the block size war was implemented with only 15% of the nodes signaling for it.