I made the tough decision recently to leave the Dallas/Fort Worth area, and Texas as a whole. The traffic is unbearable, the jobs aren't paying enough to afford the skyrocketing cost of living (unless you're in tech), and the metroplex is overcrowded. I'm not going to blame anyone, although I could go for low hanging fruit.
That being said, I see the writing on the wall and will issue residents of the area a dire warning: The cycle will reach its apex and the decline will be rapid. We've seen it happen before. California used to be a middle class paradise. First it attracted the right people, then it attracted the wrong people, then it became hell on earth.
D/FW and Texas will always have a special place in my heart, but it just doesn't feel like home anymore.
Personally, I think any metroplex-ish area sucks, but I'm not big on large cities. That being said, all of those problems are more of a urban city problem in general, not really unique to D/FW. I'm sure the more rural areas of Texas are still great. Beyond that, I wouldn't really say its the "wrong people" coming into these areas. It's been proven multiple times that the people moving to red states, Texas included, are overwhelmingly red.
But your point still stands. It's an unfortunate side effect of basic supply and demand. More people want to move and live there, therefore increasing demand, while the supply is lagging behind. Thus resulting in the ridiculous cost of living. Then of course there's the horrible traffic and all the other problems that come with having the population of a small to medium sized nation packed into 3 counties.
Unfortunately, those facts don't change even when it's conservatives and patriots moving into your area. So I can see wanting to move out of a metropolitan hellhole on that fact alone.