Well, what happened is that they got too corporate, and their head hunting has changed a lot because of that. Way back in the day, if you got your work in front of an editor, and you can find them at conventions, and they felt you were good enough, there was a chance you would get hired. Or they would take your contact info and get in touch with you when they felt they could use you for something. That's what happened to Jim Lee, Rob Liefeld, and many others. Nowadays, what they will want to do is put you through all these workshops and crap and you've got to get accepted into the workshop, which isn't easy. A lot of people are like, "forget this, it's not worth it." And I ultimately agree. It's not worth jumping through their hoops and probably still not getting in. And even if you go through their workshop, you might be seen in some New Talent Showcase, or whatever, but it still doesn't guarantee you will get a lot of work.
So what you're saying is true in that the talent has more and better options these days, but DC makes the problem even worse by often making the process of getting new talent more complicated than it should be. They're also full of themselves. If you haven't been published anywhere, they probably won't even consider you even for the workshop. And yes, at the end of the day, they aren't paying that much, so again, it's not worth it to a lot of people.
But, that talent is out there, and if DC is willing to pay them to draw, they will take the jobs. I see talented creators taking indie jobs all the time, because they like drawing and like getting paid for it.
All this said, I still believe that DiDio made his cutback primarily because the books aren't selling enough and thus the company is consolidating.