the "I brought her back because I was told to" theory
Way back when Kirsten took over the Relaunch, IIRC, she mentioned that she really wanted
to write for Janeway. That, to me, suggested that Janeway wouldn't stay dead forever. The Bring Back Janeway crowd never seemed to pick up on this tidbit, maybe because it took away their opportunity to keep complaining.
I was actually predicting a VOY 20th anniversary return in 2015. I was a few books out.