So as a hacker or an entrepreneur what product would you create if you have 5 years of time if you were sure you can not fail ? to put differently, What are the tough problems you think we need to solve but you simply don't have that much time or resources to do it? a new Mobile OS? file system? new language? what could it be?
EDIT: From the many comments, its interesting to note that some of the ideas are borderline science fiction! Amazing to know what a mere 5 year timescale allow human mind to think up.