IMO I don't really think delteria will be as successful as its hyped up to be. I think it will be more enjoyable to play but after a month or two when people finish the quests there won't be much to keep them there. And I think that's mainly due to the fact it's not p2w. One of the largest reasons people stay on era and classic is because they've bought stuff with rl cash and don't want it to be a waste.
Maybe if they had a bigger map with more things to interact with and do, but from my brief time of working there before I quit I just felt the map was too small. I probably missed something but to give you an idea I was surprised when I found there's only one island as I had explored the majority of it in about 40mins to an hour and expected there to be other islands.
I could be wrong though because this was about halfway through last year but according to my insiders not a lot has changed in terms of the map.