As I say to my kids, "you have a lot of words"

Here is my opinion (if I understand what you are saying).
You are saying there will be a successful women's league and when that happens, the DA will be there to start the groundwork for quality Pro level talent. Successful in your opinion is a league that can support itself and pay competitive wages.
NoGoal is saying there will never be a women's league that is a major sports attraction, so college is all there is for most. Some will finish college and go pro, or go pro after being on the WNT.
I think there are two different issues here. First, I think in order for the women's league to be "successful" they really do need to be a major sports attraction (Maybe not NFL, NBA or MLB level, but up there). I think the biggest women's team sport in the US is basketball. We have the best players in the world playing in this league. Yet, they couldn't survive without the support of the NBA. So, going back to your definition of what a successful league is (self supported while offering competitive wages), even the WNBA isn't successful. So, lets say that they just need to have the ability to survive over the foreseeable future and pay competitive wages, like the WNBA.
Then I would think they would need to attach themselves to the MLS. But, that would mean the MLS will need to be a major sports attraction. Because they would need to be big enough to support themselves and a women's league.
As to your next point of the DA providing the framework to the professional league(s), I agree. But, I also think the ECNL as well as USYSA is/ were doing the same thing. I don't believe we have any lack of talent on the women's side of the ball. I also don't see where the DA will provide anything different than what is already out there.
The issue when talking about each of these leagues is, we are talking about "youth" sports, then Pro sports. There needs to be another layer of competition between "youth" sports and the pros (on the women's side). Currently that next layer is college. I think for your vision to become a reality, the NWSL needs to be that next layer and the WMLS needs to be the tip of the pyramid. But, until the MLS reaches the point that it can support itself and a women's league, I don't see it happening. So, the problem is on the men's side of the ball
For my daughter's sake, I hope there is a successful women's league, but I think she will be long out of the sport if/ when it does happen.
Damn it, now I have a lot of words