Challenge modes Future

Current challenge modes do normalize people's gear and levels down, so current challenge modes will always be the same (or near same) difficulty into the future. Not exactly what you mean, I know, but that kind of tech does already exist.

Challenge modes are already the most efficient way to get Valor, which is pretty rewarding. If we put an item at the end of it, either it's going to be low enough ilvl to be worthless to the types of people tending to run challenge modes (progression raiders), or it's going to be a BiS, at which point challenge modes become required for progression, tuning suddenly becomes a really big deal, etc. etc. It's not the intent of challenge modes, and not somewhere we're planning to take them.