the real weak link is the right side. the left will be fine...not studly, but fine with kalil back and amini having a year under his belt. i'd still expect to see amini struggle, but mainly because he's still in his first couple years where they are likely to have roller skates for cleats.
the right side can be upgraded pretty easily without breaking the bank.
we don't need a stud OL. we don't need perenial all-pros or even pro-bowlers (not that the pro-bowl designation means jack). we just need guys who aren't going to get pushed around and who can get a little bit of a push. with the RB corps that we have (way under-utilized, overpaid, but still reaaaalllly good), and cam being the mobile playmaker that he is, we just don't need much on the OL except for being serviceable.
i would say adding another playmaker to the WR corps who can get open and handle/command double teams with a serviceable OL would help out a lot more than having an elite OL with our receiving corps as-is.