Now you're all probably wondering, 'how can you actually claim that we're entering the post-Patriots Era?' It's simple, their window of opportunity has closed. To just get straight to the point, they missed their golden opportunity and unfortunately for them, this year will not result in anything similar to last years spectacular run.
Not necessarily because they don't have the talent or team to provide a threat to the rest of the league, rather because they had one year and one shot to do something never before done.
Several other teams in recent memory have missed out on claiming the grand prize, and the following season never recovered. Similarly, there are teams that did capitalize on winning it all and then the following years had meaningless season - similar to the season the Patriots will have.
Case # 1; The 2004 Auburn Tigers
In an unfortunate event, Auburn did not make the national championship game and finished the season ranked at No. 2, despite their perfect 13-0 record. It's a shame they didn't get to play for the national championship, but that's not the point. The point is that each of the following as well as the preceding seasons were nothing in comparison to their team in 2004. The window of opportunity for Auburn was 2004, and they didn't win.
Case # 2; The 2005-2006 Dallas Mavericks
Unlike the previous point, Dallas actually had an opportunity to play for the championship. However in a similar situation lost to the Heat in six games. What makes this more compelling is the Mavericks won the first two games before collapsing in the last four. The next season the Mavericks actually had a better team in the regular season but lost in the first round and again in the following season lost in the first round. The Dallas Mavericks' window of opportunity was 2006, and they missed it.
Case # 3; The 1997 and 2003 Florida Marlins
The only difference between this team and the previously mentioned, is that the Marlins capitalized on their
one year. Leading up to the 1997 season, the Marlins never had a winning record, but in 1997 magic struck and they won in their only good season. Again in 2003, having only had one winning season prior, the 1997 season, the Marlins did not have a competitive team until 2003 where they took advantage of their one good season by winning it all. The seasons that followed were similar to all the other non World Series title years.
Case # 4; Super Bowl Losers of the previous decade
Six of the past seven Super Bowl losers have not made the playoffs(New York Giants 2001, St. Louis Rams 2002, Oakland Raiders 2003, Carolina Panthers 2004, Philadelphia Eagles 2005 and the Chicago Bears 2007.) This clearly shows how each of these teams' window of opportunity was the year in which they made the Super Bowl.
With all that said, I'm not convinced the Patriots will not make the playoffs. I think they'll end that trend, but they will not have the same dominating team that missed out in 2008.
Besides the scenarios provided above, they simply do not have as good of a team. The Patriots aren't getting younger, and the old guys that make up the core of their defense(Tedy Bruschi, Mike Vrabel and Rodney Harrison) are slowing down. Not only that but this years Patriots lost a lot more in the off-season then in previous years.
Most notably, they'll miss the presence of their two standout cornerbacks Asante Samuel and Randall Gay. Both corners opted to test the markets in free agency and signed with different teams; Samuel with the Philadelphia Eagles and Gay with the New Orleans Saints.
They will, however, bring back a similar offense from last year which set all kinds of records; but don't expect it to be as dominating again this year. By the end of the season several teams had started to figure them out but couldn't come away with a victory. Both the Eagles and the Ravens provided the Patriots with scares despite coming up short in the end. The Giants also came close in week 17, and proved that they only needed one more go around before they could beat them. I'll look for this as a main reason why the Patriots won't be as strong in their year following the Super Bowl.
The Patriots will play six teams that they played last year again in the 2008 schedule. Excluding the division opponents, who helped created arguably the easiest division in football with the Jets, Dolphins and Bills, they'll be playing Chargers, Colts and Steelers all over again. I look for these teams to really hand it to the Patriots in their second go around (third for the Chargers.)