GMforPowergamers
Legend
this looks like (and I know it is well intentioned and not what I am saying it looks like but looks like) something a corp person would WANT out as an idea... "Don't buy our books just give us lots of talk and name recognition... you will show us how bad we are when you keep our product relevant and in the popular side of things... keep playing"Keeping playing D&D but not spending any money on wotc products probably sends a stronger message than abandoning D&D completely. wotc will see that the game is still popular but earnings are still going down.
If you want to hurt them move on. SPend that money elsewhere. Tell everyone you know "D&D is dead, Rifts is the game to play now" and tell them every chance you get. Show them as Rifts booms even if it doesn't MATCH D&D just let them see the money flow
I choose rifts since it was the first TTRPG I learned but insert TORG, Vampire, Savage worlds, Fate, what ever