a. you can bring the Warden back in Awakening
Its already stated that if you "brought back" the HoF back the game either assume you did the Dark Ritual or take the "No Compromise" route (killed the other Warden).
Also, in DAI you cannot "bring back" a death Warden who did the US. New game overrides old games (sadly, in some instances).
So HoF remains apparently abandons the Wardens as soon as possible after the Blight. Considering their drink or die philosophy that indicates, as I have said before, that HoF in a logical universe is in danger from the Wardens themselves. After all they do not want their secrets revealed.
Dunno why, as in DA2 it is revealed the HoF and the First Warden in Weishaupt are working together to benefit all the Order from Avernus' research.
I thought about the Codex Grey Warden Letters where, if you allow Avernus to pursue his research without restriction he is obtaining "shipments" from the new Warden Commander in Ferelden, and since he experimented on people - i.e. Wardens - the shipments are likely more sacrificial Wardens
That mission only appears if you have spared Avernus and allowed him to do the research (ethically or not). That Warden-Commander of Ferelden signing the letters? Is the HoF, depending on player's choices, as that mission isn't obtained if you did the US or took any of the pre-made save states (that means this only happens in world states were the HoF deliberately allowed Avernus to do that).
I considered that the Wardens know that women wardens can become broodmothers (Duncan surely knew) and still recruit / conscript them for that ever self serving greater good regardless.
a. Women doesn't became automatically into broodmothers, as Utha proof (a female dwarf that has been ghoulified for around 21 years by the events of Awakening). To be converted into broodmothers a woman must be survive a process not all ghouls survive, not by virtue of only being tainted. And also, Word of God the Wardens didn't knew how the broodmothers were created until the HoF and Alistair discovered it in the game (according to this). So, Duncan didn't knew about that.
b. Yeah, self-serving. Since the land can heal itself from a Blight... Oh, wait. It cannot.
I considered that the Blight can be stopped without a Warden sacrifice and the fact that they are hunting power much like the Inquisition took power to stop
Well, good luck with that. Even Flemythal saved Alistair's and the HoF's hides because "is the job of the Grey Wardens to stop the Blight". If she, who was there and saw how bad became Andruil because her "armor of Void", thinks that only Grey Wardens can stop the Blight... then, I bet on her (and I trust her in this matter more than in Racist Eggman).
The Wardens of my canon state remains in the south, ready to stop any possible Blight and other darkspawn stuff at any time. And I don't regret that choice because the epilogue reveals that, if they are allowed to join the Inquisition, they learn from their mistakes and became a better order.