Did somebody say Dynasty?
If you're point is that there is never been any such thing as a dynasty in the NFL, that's your opinion, and is fine.
But, on the other side of the coin, if the: 60s Packers, 70s Steelers, 80s Niners and 90s Cowboys were dynasties, than this Patriots team is as much a dynasty as the others.
I'm old enough to remember the Steelers of the 70s who were AWESOME. And I actually lived in SF (about 10 minutes from Candlestick Park) for part of the Niners' glory days, and saw first-hand how dominant they were. And all of us remember when Dallas had things firmly in control with Aikman, Irvin etc.
So, when I look at what SB teams in the current era usually do after their SB season (think Ravens, Tampa Bay, Oakland, etc.) then three SB championships in four years (and still going strong) is pretty dominant.