Who are you going to get to replace Havs, and play at the same level (whether you think it's good enough or not) for $6M? Is there a $6M per year RT out there that would improve the OL? There would have to be because I don't think there's a better RT on the team than Havs, right now.
I don't have a man-crush on Havs but other than 1 year, he's just been solid and sometimes solid needs to be good enough. Can't have stars at every position, that's for sure.