i like the idea of the castaways not knowing whats coming...not knowing what will happen...

example...

say you have 18 survivors...place them at one location...make them all work together...than they play the challenges while alliances are not strong yet...

in each challenge the bottom 1/2 will go to tribal council causing the survivors alliances to fall through...

but during the challenges change things up...where say the winner of the challenge "must" choose one of the bottom 1/2 members to switch places with one of the top 1/2 members causing even more strife...

survivor unfortunately has become to predictable...we know they get together and some are picked off quickly...in what i described the first 5-6 ppl evicted could be very exciting...and could make the beginning more controvercial...