all i can say from my experience in game is as soon as the quest line info was released I had 5 friends immediately quit over it.
Several more in game just act morose and hang out by the guild house waiting for their sub to expire.
and this is on top of all the ones that have quit because savage keeps breaking raid groups and diadem is nothing but grinding the same thing over and over forever

I mean what can you expect?
The first step of the new relic is a carbon copy of one of the most outspokenly hated steps of the last relic
The next step is just running tons and tons of outdated content for no apparent reason at all
and then it's just grinding old content for like a month straight for the sole purpose of getting a weapon that is about equal to something you can grind out in 2 hours or less

The entire questline is just re-used concepts on old content. Nothing about it feels epic at all and the reward is just kind of meh too

It's over the top long, It's entirely made of recycled old content, and the rewards are pretty subpar

Sure the people still around are still happy, but i sure miss all the ones that quit over the lame patches