Bidirectional termination from one end only
If the prop delay is less than the rise time then return loss won't be a problem. 

But when it is longer in prop delay than the rise time, ringing may cause ringing with inductive lines. 

With a controlled impedance transmission you get better noise immunity but still get end reflection undershoot.

So it depends on your bandwidth requirements, prop delay, signal integrity requirements and tolerance to EMI.