Well provided they draft someone at #42 or higher who can play both Guard and Center, I don't think the depth is so bad, actually. McKinnie looks like good depth along the interior (with the rookie sliding to Center if Hangy goes down), as other teams have trusted him as a starter in the past. Bell would be the third Tackle...this is where I can understand people taking issue, but the team appears to be high on the kid, and the OL guys on this board who saw him in the preseason last year were encouraged. His weakness coming out was strength issues, and having been in an NFL conditioning program for a year, you'd think he'd have made some progress on that front. There also exists the possibility that if a Tackle went down, rather than use Bell, they could shift Butler back to Tackle and bring McKinnie off the bench.
Also, I think people overestimate the standard for backup offensive linemen around the league...I imagine with McKinnie and Bell being our two top reserves, we would be no worse off than most other teams. Just a hunch.
As for the starters, I think the unit will look remarkably similar to the way its looked the last three seasons or so. They won't be elite pass blockers but they will hold up well enough in pass pro. The run blocking will be poor against most quality opponents, and adequate against not-so-quality opponents. We have to hope the threat of Evans and Owens will open up rushing lanes that weren't there last year. I don't think a rookie OT can change things a whole lot...however, I do think infusing the defensive front seven with two good, young players at DE and OLB could make a real impact, so I'm more inclined to look at those spots.
My ideal draft is Ayers, Orakpo, Maybin or Raji at 11, an OLB, DT or an interior O-lineman at 28, and another of those three at 42. But please, no tight ends or OTs at 11...the defensive line NEEDS that pick. We'll see how it goes, should be a fun day.