I assume by your post that you know something the rest of us don't. Here's what we do know. Jerry prior to his injury was thought to be at least adequate, Cogs was at least average, and Clabo was a new addition thought to be at least a decent short term plug. And of course there was the flirtation with Albert and Winston, so I believe it a bit disingenuous to say he didn't try.
Now lets be clear, I have been an Ireland basher off and on, but as you recall, we did play pretty hard in the FA market and evidently the team consensus, as evidenced by the contract terms you speak of, was to go with what they thought was an adequate or average o-line this year and then upgrade that talent, if needed, next year.
I believe this to be a team decision rather than resting solely on the shoulders of Ireland. It's seems pretty clear to me, based on the preferences in personnel by this coaching staff, that Philbin and company writes the grocery list and Ireland goes shopping. Ireland doesn't seem to be forcing unwanted players on an impotent staff.
So really your post is a bit inaccurate, and honestly, faulting someone for realizing things aren't working out as planned and exploring solutions is illogical.
I would say, he is doing exactly what he should be doing. Recognizing the problem, then trying to fix it. And frankly, for all we know, he may be trying to fix something HE wanted fixing prior to the start on the season, but was convinced otherwise.
I only know what I saw from last season: an offensive team that had an offensive line that had a broken down left tackle, a right tackle who was a turnstile, and guards who were unfit for the type of offense our head coach wants to run. On top of that we had the worse wide receiving corp in the league, having traded an all-pro wide receiver for a draft pick used to select a kid who was possibly the worse Dolphins high round draft pick in the last decade. And who put that team together? Jeff Ireland. He spent megamillions last year on a wide receiver who has not yet worked out and on middle of the road linebackers and did nothing to improve the o-line. There are those who anticipate and those who respond. Jeff Ireland is a responder. He is never ahead of events, only responding to needs when they become critical and when the cost to fix them is more than it should be to fix. [And I haven't even mentioned letting Bush go to Detroit and replacing him with the pedestrian talent that is now in our backfield.] So, now when there is no talent left on the market to be had and the overaged mediocrities that are available are going to cost us future second round draft picks Jeff Ireland decides that he needs to fix his offensive line? And we're supposed to be impressed with this leadership?