People will expect to be spoken to in visual language sooner than you think. The key issue is getting the right graphics and the right words together in an integrated set of communication units. That is a major subject in my book. I am not advocating gratuitous pasting in of just any graphic element. There's a lot of software that kids use on their home computers and at school that exhibits visual language.
Many kids already use it.
They have the tools. They use the draw and paint programs. They have cartooning software. They use the internet. The world wide web is full of visual language pages.