They are still closer to the small market teams than the big market teams. The #23 team is only 10% less valuable than the Nats at #16. If you jump up 7 spots from the Nats, the #9 team is 33% more valuable. All the small guys are bunched together in the bottom half of the rankings. The lower you go the less difference there is in valuation between teams. Like I said earlier, there are the big boys and everyone else. In any ranking, there is always the top, middle and bottom. With regard to baseball franchises the teams in the middle are much closer to the bottom than the top. There is a lot of bunching in the bottom 20. One thing is certain is that they are not a big market team.
The Nats could turn things around, but they will have an uphill battle generating a loyal following. IMO their problems are not solvable merely by building a winning team.