You still have to get that content from somewhere. Storage space isn't really the limitation there. Plus, even if you could, what would be the motivationto store eeverything locally, when 1) you rarely watch a show more than once, and 2) you can stream it instantaneously anyway?
Maybe you have better internet than me, but my streaming quality isn't always HD, and if I fastforward/rewind I generally have to wait a while to rebuffer. Do an advance download of everything in my watchlist, and the next episodes of the series I'm watching, and everything will by high quality, no wait, all the time.
Besides that, just because something's available on streaming doesn't mean it'll stay there forever.
