I disagree - even in today's environment of "unrestricted free-agency". O-line is the place of greatest scarcity. It is a place where intellect is as important as athleticism. And it takes 5 of them working cohesively on every single snap. The top programs historically are where they are because they manage to get the best of the best at those positions. Very few players are physically and mentally ready to be great O-linemen directly out of high school. Not only does IU have to be able to recruit with the best teams in the country for these players, it has to develop them as a unit. Even with transfers, it takes time to build at this position. And one or two key injuries can mean serious setbacks and drop-off in play. The guys who play this position get no individual glory, so they can't be lured as easily by promises of being "featured". The best want to play for teams who win at an elite level. We have to prove we can do that consistently and demonstrate that we can put O-linemen in the league.
I'm not saying we can't, and we are closer to that now than we've been in a long time - maybe ever. But you can't go get one elite player, like a program-changing QB, or running back, or receiver, or pass rusher, or stud linebacker and significantly elevate your team.