I agree with your prediction, but it scares me that a medium that should make communications easier will actually put more barriers between ages.

I already do not understand SMS spelling: in 50 years, probably a 30 years old person will not understand things written by a 15 years old person.

Conservatism in schools has the advantage that we can still read Shakespeare (or Dante) without translation. Languages that change too quickly defy their own purpose (i.e. being a common ground for people to communicate).