Will benefits of edTPA offset any disincentives to teaching?

Jim Broadway, from Illinois School News Service discusses the merits and shortcomings of the edTPA.
"What is the edTPA? What does it do and what sort of effects is it supposed to have? Will this new process be welcomed as a chance for teacher aspirants to show their stuff? Tony Smith's memo gives us some spin on these matters:

'The edTPA is designed to ensure that those who become teachers not only understand educational theory and subject matter content, but can demonstrate their ability to lead a classroom and support students in their learning," he wrote. "New teachers have to be effective from day one.' Sounds okay, huh?"