Obviously, you can't make too many predictions based on a game against a team as bad as the Texans, but there were some signs of hope. If Portis is healthy, with all the weapons the team has, they can generate some offense.
Clearly, the playcalling was drastically altered to compensate for Brunell. A passing game consisting entirely of short dumpoffs will probably be hard to sustain against better teams, but the reason for hope is that this offense, with Al Saunders, is the same offense that Priest Holmes and Larry Johnson went wild in over the past few seasons. If Portis is healthy, he could very likely do the same, which would take a huge load off of Brunell.
I'd like to hope that somehow Brunell will gain enough confidence and grasp of the offense to start getting the ball to the WRs downfield, but I'm not holding my breath. If he did, it would change the prospects of the team dramatically.
Right now, I think it's fair to say the team's chances rest primarily on Portis getting back to 100%, and getting Springs back in the lineup.