What are your predictions about data storage?

I'm in the market for a new computer, likely another 15-inch Macbook Pro Retina, and so the question arises whether I want to pay an extra $500 (USD) to upgrade from 500 MB flash memory to 1 TB.



Here's what my usage looks like now. I'm pretty full, but there's a bunch of movies I could delete and not miss. So I think I could easily be fine if I were better at hard drive housekeeping.

This gets me to thinking: what about the next 3-5 years of storage?