To expand on Viking's post - The 737s that have 2 jumpseats will slowly be removed to just 1. I know, it sucks... $$$ and weight savings.
I also have first hand knowledge that there are a very small # of CAs that will not take a 2nd jumpseater on a 2 j/s 737, due to restricted space behind their seat. Another "YHGTBSM" and I would personally NEVER do that, but you know the types....
