I hope not. If they want to do an All-Stars they should have an extra, shorter season in the fall or spring. Leave the main summer season for new players. I can't stand what Jeff Probst has done to Survivor, and it's slowly infecting BB as well.
I can see some players going back to Survivor since it's a bigger physical challenge and it only lasts 4-5 weeks, but what sane person would keep wanting to sit in a house for 3 months, three or four times? That's giving up a large chunk of your life to play a slow-moving game and maybe (if you're lucky and not a creep) to become a D-celebrity.