Norris should be our starting catcher opening day. He's the only real prospect we have outside of Harper. Maybe throw in Moore.
Ignoring the fact that Norris still has plenty of non-bat-related stuff to work on (and has yet to put significant time in at a league above single A), I think you're putting your definition of "real prospect" ridiculously high if you think Harper and Norris are the only ones we have. The Nats' farm system isn't loaded but it's not totally occupied by organizational guys, career minor leaguers, and failures.