Using TFA's 40,000 Rejects

The New York Times today has a feature on how competitive the Teach for America application process has become. Here’s my question: if so many people at elite universities want to teach after graduation, why are these schools not creating programs that allow students to get certified to become real teachers?

I have no idea what the answer is, or if this is discussed anywhere, but it seems like if there are over 40,000 rejected TFA applicants, at least some number of them would have happily elected, as I was lucky enough to have the opportunity to do so at my college, to do a one year teacher training program their senior year. And perhaps after spending a a full year in training, these new teachers might actually commit to continuing to develop their craft over a long teaching career, rather than being like Lebron and using TFA simply as ” an elite brand that will help build a résumé.”