In the worst foreseeable case, desktops/laptops become so rare that they costs tens of thousands of dollars. Children interested in programming will then have a massive barrier to entry.
Really another form of making Stallman's 'Right to Read' a reality; instead of licensing debuggers, you make all mainstream OS's a non-Von Neumann architecture.
http://www.gnu.org/philosophy/right-to-read.en.html
http://www.codersnotes.com/notes/the-death-of-the-von-neuman...