That's really not true for Human Noble.
It is if the human noble in question had no desire to be a warrior, loved their family, resented Duncan for blackmailing their father on his deathbed to get a recruit and was clinging to his relationship with Morrigan before taking her proposal of the Dark Ritual as her having been manipulating him all along.
Fighting disgusting, hideous monsters for the rest of your life under orders from a foreign power, never having a family of your own, never being allowed to carry a title and either dying slowly of darkspawn poisoning or unceremoniously on one of the things' blades is, to put it mildly, a very depressing future to look forward to if violence, adventure and glory aren't actually your thing. And let's not forget the potential psychological impact of a female Warden's encounter with a Broodmother, knowing that the Taint is already corrupting her body in that direction.
Obviously you can play every Warden as adjusting quickly to their new status, or even seeing it as a step up, and most do because it's easier and seems more exciting to roleplay, but realistically that's not how everyone would react. I daresay you wouldn't be overjoyed to be pressed into that kind of service yourself and subjected to half of the things the PC is. If it was me standing in that situation, and I wasn't seduced by Morrigan, then I think I'd probably look at the Ultimate Sacrifice as a relief and prepare myself to meet the Maker/the Creators/become one with the stone with gratitude.