If they do anything on offense other than O-line, they're crazy. Any argument that the O-Line this year is "playing well" is equally as crazy. The combination of play calling and RG3 is masking huge deficiencies for most of our starters. Sustaining drives and time of possession will win games and championships. Put a SOLID O-line together to protect RG3 and with different play calling/scheme along with RG3's talent will mask any deficiencies at other positions. The deficiency drop-off at those skill positions is much less than that of our current O-line. Protect RG3, give him a few more seconds per play to pass and we wouldn't need a Green/C. Johnson at receiver or a Gronkowski/Graham at TE.
By the same argument though, keeping opposing offenses off the field and preventing big plays also wins games and championships. Allowing teams to routinely score 50+ yard TDs won't get you very many wins. By adding the right pieces in the secondary, some of those plays don't happen, teams don't stay on the field, Redskins win at least 2 more games at this point.
In my mind it's all about balance. This coming off-season, additions are needed at Offensive Line & Defensive Back. If that happens, the Redskins become a perpetual force in the NFC starting 2013 or 2014 (assuming they continue to add players through keen evaluation and with balance in mind.