All That Jazz, it's great you're so passionate about Lea Michele, she sure showed talent on GLEE at one point (I thought she was pretty funny during the first season). However, you have to be a little more realistic about her place within a larger context outside of GLEE fandom. NEW YEAR'S EVE was a huge flop, not just financially but critically; in Hollywood you can have one or the other but not both, it doesn't usually fare well for a young actress starting out in film. Second, you can't ignore what Kad (who constantly provides reliable inside info) said about the high profile auditions she didn't get, it's very telling that lesser names--Lauren Ambrose in FUNNY GIRL and Jessie Mueller in INTO THE WOODS--got roles Michele was seen for. For whatever reason, I'm going to guess a combination of talent, charisma and professionalism, the producers/directors/casting agents/etc decided to go for a different person who was not Michele. Simply, she's not someone people are falling over to work with.
Elphaba will be the most sought after role for young actresses in Hollywood if/when the film of WICKED gets made. It's just unrealistic to think Michele would be cast over say Jennifer Lawrence (if they're looking for non-singers A-listers) or Samantha Barks (an up-and-coming singing actress who was well-reviewed in a massive worldwide big screen hit).
And you can hate Taylor Swift all you want (I don't feel strongly about her one way or the other) but Lea Michele could never be Swift in a million years, Swift has the "it" factor, she writes her own music and, most importantly, is beloved by people. Michele might have the better voice but she's not beloved by anyone except Ryan Murphy, the GLEE fans and her family I imagine. In short, there's no way she'd just win a bunch of Grammys if she released a solo record.
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"