I don't want to see anything more recent than say 30 years ago on a CLASSIC movie channel. It should be like the Rock and Roll Hall of Fame. A movie should be at least 30 years old to be considered for addition to their roster.
But most of the movies of the 70's are nearing that mark, as are a few of the movies of the 80's (and TCM actually showed movies like Batman Returns, Dick Tracy and Colonel Redl-all from the 80's and 90's [and yes, I saw them shown on that channel.]) Granted, the last one was shown in their foreign film block the channel has (had) on Sundays, but yes, TCM's shown them (and before I forget, they've also shown 2010-broadcast on the last day of 2010!) If they can shown these films, they can also show the original Star Wars trilogy.
Like it or not, the 70's and the 80's are now the past (classic), and TCM should be showing movies from these eras.