If you don't think the Cards need to fix the O-Line then God have mercy on your soul. Lutui is pretty good but other than that. . .
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Even if the Cards did bring in a stud QB I'd be freaking out about the fact that he's going to get killed a million times a game. 50 sacks in a season is down right terrible. If the Bears didn't have the worst offensive line in NFL history the Cards would have given up the most sacks in the league.
I think they need to upgrade the OL, but I think that the talent is there. A year ago, the OL was talented enough to win the NFC West. The only position that's likely to be replaced/upgraded this season is LG when Faneca retires and RG if Lutui leaves.
The terrible quarterback play (which you missed because you weren't following the team yet, but it was literally the worst quarterbacking seen in the NFL in maybe a decade) made the offensive line look worse than it was. Teams were relentlessly blitzing and the QBs couldn't do ANYTHING to make them pay. In the Raiders game last year, Larry Fitzgerald was matched up one-on-one with Kamerion Wimbley and Derek Anderson over threw him by 8 yards.
There
is talent on the offensive line. Brandon Keith has promise; the team still believes in Levi Brown. Deuce Lutui has Pro Bowl ability and attitude. This is not the least talented offensive in the NFL. There's a scheme problem (IMO) and there's a quarterback performance problem.
The offense was sending 4 or even 5 WRs into patterns at times when the D was blitzing six or more players, and the QB couldn't find the open man. That's not on the OL's fault.