I was traveling to Dynamis regularly for S ranks when Dawntrail released. What I witnessed there was a very lively data center, with people traveling from all over to play with their friends, RP, recruit to FCs, do the usual things they do at all the city states like Bard music. Roulettes popped, which I think is more than could be said when it was new.

As for whether it will ever be like other data centers, yes. I used to be on Crystal, which got some of the most dead worlds from Aether and Primal and merged them together. Many of the people that were diverted to Crystal by SE decided to transfer back to Aether, leaving Crystal comparatively less populated. It still had established players and FCs who remained, giving it an advantage over how Dynamis is, but its population was comparatively lower than, say, Aether.

At some point, I think at EW release, that changed and Crystal regularly surpassed Aether and Primal in active population and still often does. This was probably thanks to Aether being given Congested status a lot, but it shows that given time, data centers grow.

There is the rather universal issue of "people traveling to Aether to raid" that is an issue for all NA data centers, and will likely hinder Dynamis a lot, but it will still slowly improve over time.

I should mention that your character is on Golem though. There are Dynamis worlds that are further along than others due to being around longer. Seraph often gets Congested status for example.