So their belief is basically that soon they will all be Amish and revert back to a 16th century lifestyle. Even though they will be able to use 100% of their brain, there will be no technology, just milking cows and eating vegetables and raising barns. The Watch Tower even hired Weird Al to make a video depicting what it will be like. (ok not really, but this is exactly what they think it'll be like.)
We'll all be Amish living in an Amish Paradise