I personally find the resolution to the DR very satisfying. The emotional power of the scene with Morrigan and Flemeth in DAI with the DR performed is so much stronger than the funeral scene for the US that I wouldn't consider another ending for my Warden. The character development it gave Morrigan alone is worth it.
In the past, I've been one of the louder voices in calling for the DR and OGB to amount to something. I've never claimed it needed a game of it's own, or that the child should be a future PC, or anything of the sort. I just wanted there to be something, and what we got was definitely something. At the very least it seems to be a potential indicator into Flemeth's plans, at most it could be a game changer in her story's eventual resolution.
In any event, as said, I'm more than satisfied with the result and don't regret it for a moment.