There have been a few characters with the temporary identity of Thor. That were great stories that fans embraced. What's wrong with a woman being in that position for a while? What if it's another great story. Odinson is still around and will be Thor again one day.
And guess what, one day there's going to be yet more people carrying the mantle of Thor. And if the stories are representations of what's happening in society, which a lot of art and literature is, then all the better.