[orph4nus]

I used to think the same as you, but you should know that your just changing the medium, using your hands instead of your mouth. The language still evolves with its culture and its users on a local level. They tried to make a universal sign language which is based on American Sign Language, but after traveling in different continents I can tell you that people using sign language, use the local version, and I don't think I met anyone who knows the universal one.

Personally I think using English as a linga franca is good enough, as most people already know it, and so there is no reason to do difficult about it.

It's not the first time people try to invent a new universal language, and see it never reach that goal.