Recent alpha datamining hints it may come back. Nothing is certain but i dearly hope so. This way, pvp gear can be its own progression, not subservient to mythic+ or rating, and can also allow for strong catchup gear from battlegrounds for people starting in patches that don't wanna raid.
Please blizzard, make this happen, its a giant step in fixing bfa's trainwreck reward system and can make bgs meaningful. Pvp should be the way to gear pvp.