That’s quite different from the other examples though. Gotham really has a different focus than telling Batman’s origin story - it’s more the origin story of, well, the city of Gotham, isn’t it?
Either way, I’ve only seen a few episodes of the show and it definitely didn’t work for me. Whereas Hannibal is of course a good example of a rework being good, and we could easily come up with more, so your point does certainly stand.
I don’t know about Xena, though. You expected Todd’s comment to be because Xena is a favourite of his, but maybe it’s just because it was a mediocre, campy show that we’re well rid of and the world is better without it? At least that’s my take on this