Yes, anyone else would have been toast after the cancelled tour, K-Fed mess, reality show (

), 2007 absolute mess debacle of historical proportions, VMAs performance, zero promotion for Blackout, etc etc.
It's a miracle that she had a successful comeback with her biggest tour ever in 2008/2009 and still continues to get hits and do well on tour now (70m is still more than most other pop stars and while she didn't sell it out she was still playing to 20k+ crowds in many of the places she was deemed to have flopped in).