hmmm....will it control transactions? Is that not the purpose of it?
If so, it affects all of us. Node runners or not.
Discussion
Nope, not all transactions. Just those for whonever want to participate in a sidechain.
Its like we all use tomato sauce from the same farm (bitcoin) but some want chunky some want spicy. We get to keep the same tomatoes but have a choice in what kind of sauce.
This is a soft fork, which means nodes and users who don't want thos new feature won't be affected.
The great thing is, for this one last change, we get a layer 2, for most future changes.