In BfA we are doing some meaningful re-structuring of the PvP itemization system, as well as the ranking system. We're still massaging the system, but we'd like to share some details which may help alleviate some of your concerns. Keep in mind some of this stuff could still change. No pony promises.
New ranking system
We're updating the ranking system to better mirror the other games at Blizzard. WoW via arena is actually one of the first competitive games at Blizzard to have a rating system, so it's fair to say it's time for an update.
To that end we want to bucket players in rankings similar to StarCraft or Overwatch using labels such as Gold, Platinum etc. (We're still going to have our own titles (Challenger, Rival, Duelist etc.)) We feel these rankings have grown to common verbage in the competitive PvP community so we're happy to bring them to WoW. Keep in mind that you'll still be able to see your rating at end of match and within the UI. And we're also looking to add your actual rank in the UI as well (as in, you're rank #10 in the region).