Before I made the commitment for next year, I called the season ticket office. They confirmed that next year the Nationals ARE going to paperless tickets for season tickets (not just the reward tickets, but the entire season).
They also couldn't give me details on things like transferability. Some NBA teams use paperless tickets to have a monopoly on resale for games you can't use, including high fees, a price floor (so you don't udnercut the box office), and/or a price ceiling.
I really hate this idea and would file the traditional tickets under "not broken". At the very least they really should give the season ticket holders full details on this before pushing the 1 and 3 year commitments.