The cards have a legit shot at the #6 seed, but I just don't see it. The Card's schedule and division are seemly a bridge too far for their team. Remember the Cards have to face Sea and SF still in addition to other difficult games, and I think ARZ loses both of them, and that's going to take them out of any wildcard discussion.
Frankly the NFC Playoff picture at this point even at mid-season is looking fairly clear at this point. Given future strength of schedules and past performances (and who is coming back), the playoff picture seems to be shaping thusly:
New Orleans will win the NFC South. It would take an collapse of epic porportions to stop this. However, New Orleans has to face a tough Carolina squad twice, and both SF and Sea. Brutal. I don't see them surviving this without a couple more losses (@SEA is almost a sure loss right there). Thus I see NO either as the #2 or #3 seed (likely #2).
The #1 seed will go to the NFC West Champion. That will be either Seattle or San Fran just like everyone expected. Seattle has the easier path since SF has to face NO at the Superdome (very difficult at best) while Seattle gets NO at home. In addition, Sea has already beaten SF once. However, the rematch is at candlestick. Given the rest of the schedules for both, I see the Winner of the NFC West going 12-4 minimum and likely 13-3 or even better....and that should be enough for the #1 seed. I also think the dust won't clear on this fight until the very last couple weeks of the season which leads to.....
The #5 seed will go to either Sea or SF (whoever doesn't get the #1 seed) and that will likely be a WC team with a very impressive record otherwise. [In short we are seeing a replay of what happened last year save that Sea and SF have switched places. Now SEA is the setting the pace and SF is hoping for a Sea stumble while in 2012 it was the other way around.]
The #4 Seed will go to whoever wins the putrid fest otherwise known as the NFC East. I am betting on the 'boys, but all of them are still in it. We may see another sub-500 playoff team!
So that leaves the #3 seed and the #6 seed. The NFC North Champ will almost surely take the #3 seed (and has an outside shot at the #2 seed). Right now that looks to be a contest between the Packers and the Lions. I don't think Chicago has what it takes to compete. Between the two, I would bet on the Packers since they have better and more consistant QB play. Megatron is awesom, but as a team IMHO the Packers are simply better.
So that leaves the #6 seed which I see coming down to between the Lions and the Panthers. Of the two, the Panthers have a tougher road to hoe.
Regardless, I don't see any realistic room here for the cards at this time.