This is what it boils down to: scarcity. Theres no room in Bitcoin for inflation of any kind. Other applications and whatnot can be built on top of it as is. Its for the world to adapt and conform to Bitcoin, not the other way around.
I don't see transaction volume increase as a change in inflation so much as a change in velocity.
Henry Hazlitt who is credited with bringing Austrian Economic theory to the English speaking world, would I think agree that is not something that ought to be artificially influenced either by constraint or encouragement. Hitting the limit would be an artificial constraint, removing it ahead of (3) would be an encouragement, but for inflation it is a no-op.
With some people, watching them wield economics terms of art they do not understand is like watching a child run with scissors.