Gotta agree with Matt - you guys are absolutely bars-in-the-window pyscho if you think Lucas has gotten better as he's gotten older. If anything, the projects he's given up to the people surrounding him are usually better off (Empire Strikes Back, Indiana Jones, and Revenge of the Sith, for example?)...
Spielberg is much, much more debatable, considering he's always been relatively reliable as a film maker. While his classics are untouchable, just about anything he works on is pretty good in my opinion... Munich, War of the Worlds, The Terminal, Catch me if you Can, Minority Report, AI, Saving Private Ryan, Schindler's List, Jurassic Park, Hook, Indiana Jones, Close Encounters of the Third Kind, Jaws, etc.
His filmography is a stark contrast to someone who is connected to major motion picture contributions such as Howard the Duck and The Phantom Menace.
Back to the Indy 4 discussion...
Sorry, I just don't see this film ever happening. I hope it does, even though my expectations would be very low.