Optimism about the Cowboys' future is definitely warranted. But a cautionary tale -- three of the four teams that made the conference championship games last season didn't even MAKE the playoffs in 2016 -- and that includes a 15-1 Panthers team with a seemingly-golden future and the reigning league MVP at QB.
This is a year-to-year league. The Cowboys were unreasonably (as compared to statistical expectations) healthy this year -- just like in 2014. Another 2015 nightmare is just an injury or two away. A slight regression to the mean, combined with a much harder schedule (AFC West and NFC West instead of AFC North and NFC North, plus swing games against Atlanta and Green Bay) and things can look mighty different even if Dak and Zeke improve.
I will call it right here, no way the NFC East gets two teams in the playoffs again next season. A tougher schedule across the board, plus bounce back years from at least a couple of Minnesota (with Bridgewater), Arizona, Carolina, etc. and up and comers like TB, means a much harder path. The Eagles (among DVOA leaders even this year) are going to add some weapons at WR. NY -- an 11 win team despite not scoring 30 a single time all season -- is going to buttress their O-Line, which is the principal reason their offense sucked. Who knows about DC.
Bottom line is that great futures are nice, but no team can afford to waste the opportunities right in front of them. Just ask Dan Marino, who waltzed to the SB his rookie year, but despite perennial playoff appearances and a Hall of Fame career never sniffed the big game again.
It was all right there in front of the Cowboys this year -- home field advantage, a bye, a completely healthy roster, and the Super Bowl in Texas. No team's path is ever easy, but theirs was on of the most favorable possible. And they go no farther than the Houston Texans of all teams, and were one and done like the Dolphins, Giants, Lions, Raiders, and Chiefs.
You might get really cool hats and T-shirts for winning 13 games and your division. But you sure don't get rings. And rings are what it's all about.