One of the main pitfalls of any theoretically 'niche' show is that you spend too much time on the 'niche' and not enough time on the 'show.'
It is little men know of women; their smiles and their tears alike are seldom what they seem.
I myself believe that there will one day be time travel because when we find that something isn't forbidden by the over-arching laws of physics we usually eventually find a technological way of doing it.