They should use these past stars to help put over the newer stars. Have Stone Cold or Rock endorse some of the new talent and help get them to the mainevent level.
WWE are getting themselves into big trouble if they continue to mask the issue with legends returning. Ratings are going to fall because there aren't as many stars as before but WWE need to take the loses in the short term for the long term gain. They need to spend more time on new stars and get the fans interested in them and then eventually once they are built more and more fans will tune in because they have become top stars. Focus on guys like CM Punk, Sheamus, Barrett, Bryan, Rhodes, Miz etc. and don't push Orton and Cena down everyone's throats because it can become overkill.