(Apparently) Unpopular Opinion: The point of a 'meta' is to change
Every complaint I've seen about warding so far today contains some version of the phrase "It'll change the meta", but that's sort of the point of adding new content to a game.
Imagine that 'argument' in any other game - No new Hearthstone expansions because new cards will change the decks people build. No new heroes in Overwatch because then people will play them and the meta will change.
You know what else changed the meta? Every positive update OSRS has ever had. MM2, Raids, Zeah, and so many others all had a huge impact on the "meta" of their time and that's what made them enjoyable. A changing meta is a good thing. It's the point of new content: to have a new experience.