Remember, I would have used the HOF as a meatsuit for Corypheus. I think that the HOF is not especially fearsome on the scale of super-powered beings in Thedas, despite managing to kill the AD. I was only saying that the idea that Corypheus would capture the HOF would not be one necessarily welcomed, anymore than the old idea of a DLC centered on the HOF dying in the Calling. Everyone has a different idea for the character. There's no way to write a consistent "end" - all you can do is write further adventures, with the justification being that you happened to be there when the plot happened.
But that's just the thing - there's no reason to think the Grey Warden's obsessive method to end the blight is any good. If the HOF is alive - if you chose the DR and saved the soul of the AD - you might very well believe that there needs to be another way beyond mindless massacre, a huge meatshield army whose only purpose is to die to the darkspawn long enough for a GW to kill the AD, and the absolute uncertainty of what might happen if you kill all the ADs.
We see - in DA:O and the sequels - that the GWs are actually really bad at everything they do. Their plans are often insane and self-destructive, when they aren't just incompetent.
Wanting to save Ferelden from the blight != wanting to work with the GWs. Again, choosing the DR is very much working against them. You're picking the "save the AD" option, either for ostensibly selfish reasons or because you believe there is a better method out there.
To me, any Warden character I have that does not choose the US rejects the GW philosophy, and the order. That's why DA:A makes no sense; but then again Bioware never wanted the HOF to be in DA:A so I can appreciate why the plot is so inconsistent.
None of those are yours - they are for the sake of the Wardens, the benefits and victories accruing to the order, not to you.
Ah, wealth and a title in an age where nobody really has a lot of options, bummer

I disagree with your opinion of what wardens are, they do what they have to in order to win and keep the world safe. I don't feel like a warden who rejects the ultimate sacrifice has turned against what makes a warden a warden at all. A better option came up, or another warden takes the blow.
A warden takes on the taint to fight darkspawn, and all my wardens did that and did it well. The only way a warden could truly turn his back on what he is would be to run during ostagar or leave Ferelden.
The archdemon is just a problem to be solved, not a sacred task you betrays everyone by not dying for when a choice offers a better solution. Not personally taking the blow does not = bailing on grey warden tradition. It's just one way of accomplishing the goal you set out to do. I doubt every other warden in the order would just die when presented with anther chance. Also that would mean any warden on the field during the blight who didn't take the blow would be shamed. That doesn't make logical sense.
However, regardless, it's bioware so if they did do this there'd be plenty of options along he lines of "I'm doing this for me". So it doesn't actually matter, if we ever see the warden again, play him as doing it for him.
I for one have never seen anything to suggest in origins or otherwise that the Hero shamed himself by living. Alistair is a loyal warden, he's not shamed by having a god baby or not taking the blow himself. Nobody from weisshaupt has ever told me I was wrong for that, so that's just your take on an order you know little about. One bioware will write on their own.
And you're not saving the soul of the archdemon, you're saving the soul of the old god it was before it was tainted. And it's optional.
Anyway, you don't like wardens, cool. You want to reverse time and bail on rebuilding in DAA, cool. I'm still going to push to see my warden again and so will many others because we love the character, but head cannon only goes so far, if the other wardens have a problem with how one or more of my heroes dealt with the archdemon, bioware will write that dialogue when they introduce me to them.
I don't understand your belief that somehow a surviving warden bails on a philosophy that we honestly know little about, but I don't have to. Still want to see my characters again, they are my favourite in the series, and therefore I hope to see them again. I certainly want a better future for them then "dead from taint" because the story was hinted at and never told.
His quest exists and it's cannon, for better or worse, I want to see it.