Likewise, if one wants to write, time is the great limiter. Writing more means reading less. Sometimes technology helps out, like when carrying a Kindle helps carve out extra time to read. And sometimes technology competes. Ever since I started posting on Twitter and Facebook, I have had a hard time keeping up with LiveJournal, both with blogging myself and with reading other folks' posts.
Sigh. I write science fiction, and that makes me think in the tropes of my genre. I want someone to invent a way to do more in less time— to help people sleep less, or to make things like commuting take less time, or whatever. Except for flying cars; I don't see any point in those unless they can keep from running into each other.