I don't know that making the playoffs is a necessity but I do think Jerry will want to see the team playing better. If they go 10-6 and miss the playoffs does Garrett keep his job - I think probably but it remains to be seen.
I really hope we don't switch philosophies anytime soon because I think Garrett/Callahan/Kiffin/Marinelli are about to put together a roster and gameplans that can go up against any team in the league and win. The albatross that was the OL will be better this year. The skill players will be better this year. The rushmen will be better this year. The coverage schemes will be much better this year and this is probably where the team will improve the most overall.
Wins are fickle, though. Sometimes you get unlucky and lose a bunch of close games and sometimes you get lucky and win a bunch of them. Any game decided by a single play is a toss-up but those unlucky or lucky bounces can have a major impact on the end record in some years.
If we have health at a couple of a few key players: Romo, Lee, Ware, Dez, Miles and Murray I think we will be very good - maybe contend for the NFC championship good if we get average OL play. If Tyron elevates to Pro Bowl play and TFred gives us average Center play and Free goes back to 2010 form we can be scary good - SB good. This could be a better roster than 2007 it is just that a lot of the key players are on the early side of their careers and many of those guys were injured last year so we didn't have the buildup year in 2006 like we did before we exploded in 2007. I really hope it all comes together for us because we deserve a good year after all the events of the past 3 years.
The fans need to start believing in the team. Win or lose, the game is just more enjoyable that way. It is okay to believe in them even if you think they can be managed better.