This is the type of show which, in true Brit fashion, should last 4 or 5 seasons, tops. I feel that they are pulling plot lines and thread out of their asses to stretch the show (why would Sarah not come out public and avoid lots of these silly plots?); however, the story line is interesting... for 4 or 5 years, that is.
The exploration of morals, "realities" etc of human cloning is fascinating. This plausible sci-fi is a great genre; a bit like the now defunct Almost Human where they explored many of these technological advances and their issues in the near future
Orphan Black is confirmed to be in discussions about next season. Hopefully there will be a third or at least a TV movie