I think they are better off not winning an Oscar, the trophy will either put more pressure on them and result in bad script choices or turn them to slackers or burn their career, usually just the nomination is enough to get an Actor noticed but none of the people on your list need a fame boost, brad, leo, johnny (Depp) each one has a league of his own, with 10 Oscars or none at all they are already Hollywood's greatest invention.
oh and i love
vanilla sky but Tom Cruise acting seems full of shit to me
Want a real Actor? check out
Tom Hanks, he's a legend.