What do you mean with the last update happening 2 years ago?
AFAICS, the last update is just a couple of months old: http://fwierzbicki.blogspot.be/2017/07/jython-271-final-released.html
I agree that the development around Jython is rather slow, but calling it dead is an overstatement. Btw, even now Ignition isn’t on the 2.7.x version (which is indeed 2 years old as you state), so the first step is bringing Ignition to the most recent Jython (which should happen for Ignition 8.0 if the rumours are correct).
All in all, Jython is still one of the better languages to use IMO.