That could never work in today's market. It only worked back then bc there were only 6 X-men at the time and only one book. They only got rid of 4 and kept 2 around. Scott remained as leader and Jean remained in the book in a limited capacity till she became Phoenix and was back on the team a few issues later. With literally dozens of X-men now, theres no way they can get rid of all of them and have a new cast come in. Even if they did that for a book, there's still plenty of other X-men titles, that that change wouldnt be felt. Remember, Uncanny was the only X-book back then. Besides people arent as receptive to new characters (ex. look at Generation Hope). There are too many X-men tossed to the side now that people would just be pissed off if they went and introduced a brand new roster, which theoretically they feel should have went towards the already ignored X-men.