You're right. It is likely that we'll see some mediocre and bad movies too, though, considering we lived through the prequels, I doubt it's something we wouldn't be able to handle. And there will always be something new to look forward to, instead of rewatching the Plinkett reviews and beating ourselves up with The Phantom Menace sixteen years later.
What I think we will definitely lose is that feeling that of a new Star Wars movie being some big Earth-stopping event. All prequels were something important at the time of their release, no matter how controversial they were. Ep VII will obviously still be a huge deal too, but the "Episode X"? Star Wars movies will become a routine. I already get the same feeling from AoU. The first Avengers were huge for me, but while I am still looking forward to the sequel, it's not something special for me anymore.