To be fair, there's been a few teams that have started at 0-3 and made the playoffs. You can't really count a team out until they start out 0-5 or 0-6...
...oh wait, we almost pulled that off last year.
Kman's right, this was just as big of a win for Dallas as it was a loss for Houston. They also "revealed the blueprint" (cliche term, I know) to beat the Texans. It was a statement game for the Texans - yes, the Colts game was a big statement too, but Houston's beaten good teams every year and fell apart in other games - and they were pretty much dominated on their home field.