Every popular artist has a era that underperforms or flops. Eventually, all pop stars decades into their careers are unble to get hits or sell as many albums as well.
Not for at least a decade. Pink is still getting hits and going platinum in her mid-30s, and Taylor will be too (provided that She doesn't take a lengthy break as Shania, Faith, Fergie, Gwen all did).
Mess at people thinking she'll never flop. Even if she is successful for decades she will still flop eventually. She won't be selling a million albums first week at 55. I'd be cool if she could but the gp will get bored and ageism will catch up.
She is too smart to crave material things so she will never flop. 
