Eh, I don't necessarily think the content itself is the issue. More so just the incentive to actually do it and how they pace the content and their patch cycle. For me they already have great content, it's just a matter of innovating on that content over time, and whether they can use it to complement areas of the game where it may otherwise be lacking. E.g., will they listen to people when they say the newer criterion dungeons need better rewards and gear attached to them, or will they ignore it?
TL;DR: I don't think the amount of content is an issue, just the replayability incentive - I suppose it's a double-edged sword though depending on the frequency of play. - I equally think given their direction behind the earlier stages of the relic, that they would do a lot better by introducing relics earlier, and either spacing them out more with a grind equal to what it may otherwise have been had we followed the usual x.35 - x.55 cycles. Or just having a greater involvement anyway, but a more proactive approach to reducing/nerfing the requirement.
As for the leaving. I feel indifferent about it. Goodbye, I guess, and enjoy another - new journey, or whatever.