Humanity has survived before without computers and information technology. We easily could again. However, something drastic would have to happen on a global scale. At the rate it's going now, information technology is the future and it would be impossibly and impractical to try and change that. Growth in technology is also notoriously hard to predict.
Since we have long ago entered the digital age, there is no use thinking of a future without I.T. All sorts of technologies are going to be evolving now, and we have to be up to date to know how to use them. If we do not have them, I think we will feel as if we are thrown back to the dark ages and there will be chaos.