Scorsese is still a freaking god, De Niro's turned into a complete and utter joke. I think he lost all credibility when he did Analyse This, it wasn't terrible, but it was a complete turnaround in types of roles. He quickly followed that up with Rocky and Bullwinkle
Most of the stuff he's done since then has been a complete farce, he seems, honestly, just unhealthy, he does this heavy breathing thing in everything he does, its like he can barely speak properly anymore and puts no effort into acting, just getting the words out. Happily takes AWFUL scripts as long as there is cash in it. Scorsese would just hurt his reputation by trying to do something worthwhile with him again.
Righteous kill was horrifically bad, awful plot, acting, directing, shame Pacino, slightly later, seems to be doing mostly bad films lately aswell, two of the old greats really wasting their talent for what must be almost chump change to them by now.