An excellent and inevitable decision, given that PvE vault rewards can be achieved by doing LFR and Heroic Dungeons. This will give casuals who want to play at their own pace to get Vault Rewards from doing Battlegrounds from the solo queue and skip the forced arena participation.
But why not give it free to honor from all modes of PvP? Skirmishes, Random BG’s, Epic BG’s and the weekly Brawl? Let everyone be able to gather rewards with their own preferred content, obviously with appropriate Ilevel scaling for unranked matches.
The blitz is a nice next step, but we can do better!