Just an idea I want to throw out there.
These are my personal observations from playing on the PC NA server, but it seems that the pvp community isn't really growing. It seems like more people are leaving and for a while that was only offset by the amount of console transfers incoming. I think it would be a good idea for ZoS to spend a bit of their time reworking the u50 campaign to get newer players more interested in pvp.
I think one of the main reason the current u50 Campaign died is because there were a lot of permanent rerollers with OP gear that they farmed or kept from their previous characters. I'm not suggesting they shouldn't be allowed to reroll, but I am suggesting the following.
1. Cap the low-level battles scaling buff of all gear to blue quality. (this is pretty close in numbers to vet GOLD quality items and is much cheaper for new players to acquire).
2. Sell full sets of some decent crafted pvp gear for AP at u50 levels. (Full set of blue quality nma, wretched vitality, fortified brass, heartland's conq etc. every 10 or so levels.)
3. Provide Good rewards for low levels to visit cyro. (things that decrease the research time of traits for gear/weapons. Some gold materials for upgrading armor etc.)
Basically, just provide incentives for new players to begin their pvp journey and when they are ready then can swap over to the vet campaign.