They are going to graduate cast members in real time, so as the seasons go by, cast members will be replaced.
I agree about a show failing due to constant cast changes. However, Law and Order was successful despite the cast changes, well that is until the last cast change which didn't work at all and finally led to the show's cancellation. House on the other hand changed its cast and crashed in the ratings and ended up bringing back much of its original cast again.
I'm going to miss Kurt the most!
There is a Glee Project reality show doing a search for Glee talent. I didn't know it was to replace cast members. I thought it was to add to the mix.
