I don't understand all this criticism and insults toward Lucas, I mean, would u prefer a catastrophic IndyIV (like the prequels of Star Wars) or no IndyIV at all? I choose the second option.
IMHO Lucas doesn't want to make the same mistakes he did with Episode I and II, disappointing most of the SW fan, so he is trying to do the best to have a great last Indy movie, and if this means a simple delay (no one said officially that the project is gone), no matter for me.
We all should be grateful to Lucas that he isn't going to do this movie only for money.