There’s zero proof of any of these statements. Plenty of other games user reticle targeting, not just ESO - the Action RPG is based around the reticle targeting system. There’s no guarantee that bringing back tab targeting would bring any players back to the franchise. It’d be unlikely to provide a return on the amount of development time required to rework everything for non-reticle gameplay (you couldn’t just port it over from TSW sadly).
There would be no guarantee that any of the TSW die hards would be prepared to switch without further changes (like the reintroduction of the massively bloated ability wheel). Balancing it so that there was any benefit to using the harder reticle mode would be a pain - why bother with something that’s harder to use when you could just tab target and shoot your target without having to worry which direction you’re looking in?
It’s the kind of idea that requires a lot of development time to get right, and SWL just doesn’t have the population that would justify that kind of investment. Even if you could guarantee that all the TSW population would move over, it still wouldn’t justify the cost involved. It’s one of those ideas that would be nice for players, but it’d never be approved by the people holding the purse strings.