For weeks the forums were riddled with complaints of the implementation of alliance-locked campaigns and when one was finally implemented (a 30-day one, at that) nobody showed up.
A lot of the hardcore faction loyalists feel like they've had their points proven with this, but I honestly think this new campaign being so dead is a result of it being introduced in the middle of a campaign in Kaal, people were afraid of making the switch, losing AP, and it ending up not being as populated. It was safer to stay in Kaal and observe the population and switch afterwards.
Now, the campaign is ending and I think if a bunch of people don't migrate over that campaign will remain dead. The time is now. Can we all collectively agree to spark some life into this campaign? All of the Faction loyalists can stay in Kaal, because that's what you prefer (which is totally fine).
But for the people who were constantly complaining of not being able to play all of their characters in Cyrodiil anymore, all of the people saying they won't ever be able to play with some of their friends anymore, and all of the people complaining that being stuck on a stacked alliance won't allow them to find as many fights, or be able to switch to another faction to help out the under dog, make the switch and try it out. We all need to move collectively as a group to make this happen. This is literally what people were asking for, and if it turns into a forever dead campaign, the people complaining about faction locks are just clowns, because this was absolutely made for the people complaining about it.
A lot of people play because they care about the alliance war, a lot of people play just to get good fights, and most everyone will play where the most people are playing. If a good chunk of players don't make the switch at the same time, nobody ever will.
It's a group effort, so if you are someone who likes not having alliance locks, and are only playing in Kaal because the standard is dead: talk to your friends, guilds, whatever, and make the switch.
If this is ends up working by the way, spreading out the population might also help with the abysmal lag.
EDIT: I made a poll asking PvPers why they play in Kaal, my hypothesis was that people give up their preferences of no-CP and no faction locks to play in a campaign with better population:
https://forums.elderscrollsonline.com/en/discussion/504167/pvpers-who-play-in-kaalgrontiid-faction-locked-30-day-cp-campaign
It's interesting to see that a lot of players would prefer to play in Laatvulon, but they are deterred because it is dead and Kaal has consistent population. More people want to make the switch than some might think, might be cool if numbers began migrating over there and players were able to play somewhere they wanted to.