Well, on the one hand I feel like he deserves it because the OT changed, in many ways, the way films were done. Having a sound track playing throughout the movie rather than just for certain scenes was not commonly done, having the credits at the end, giving the director more freedom and say over his own work, etc. And early ILM work was the most innovative thing around and changed the way effects were done.

On the other hand, based on his newer work, it seems likely that those developments were largely due to the entire Star Wars team and not Lucas' vision alone. Or, you could say, Lucas' vision and the team's implementation. That vision is absolutely worthy of a lifetime acheivement award. But those who executed it, the directors, screenwriters, effects guys and so forth deserve it just about as much as he does. Because, again as demonstrated by his new work, his vision never would have become acheivement without all of them. And I wish he knew that.