It would be a sad world with Apple in power. Mobile development would stall. PC hardware development would stall if not completely stop. Everything would be an in app payment, everything would come from over priced App stores. We would all be, "Writers", "Musicians", "Graphic Designers" or "Web Professionals". This would mean that websites only worked on firefox because someone told us it was good 12 years ago. "Responsive Design" would become standard on all websites meaning that no one could actually use the web effectively anymore for anything and there would be no way to turn it off. On the upside everyone would quickly die of cancer from having to use iTunes.