Only in the same sense the 1990s Braves were or someone with four consecutive bronze medals and one gold is. Dynasties win championships. If the Bills had won one of those Super Bowls, would they be a dynasty?
I think so. I'd define a dynasty as a team that is at or near the top for a long period of time (5 or more years), so by that definition the Braves, the Dodgers, the Giants of the early 2010's. If you limit it to teams that win multiple championships then you don't really ever have a dynasty anymore.
WRT to the 2012-19 Nats, given we never advanced in the playoffs until 2019 I'd omit us from the dynasty discussion even though that was one heck of a run.
