What would you do with 300 terabytes?
Well....be careful with this question (based on current technology and perceived needs/limitations). aa
Two other guys asked themselves the same sort question many years ago and we're still dealing with the fallout from the answer.
'Would we ever need more than 640K of base memory'. Bill Gates and Paul Allen when they were building the first version of MS DOS.
None of knows what exciting content might be available if things like huge cost effective storage capacity were a reality today. I can remember not so long ago when game makers were pining away for better graphics cards, etc. so that they could use more of the potential of the latest design engines they had to make killer games. These sort of interdependent cycles go on all the time in high tech where one development allows many other to leap frog forward past a previous limitation.
I never thought I'd EVER fill up a 60Gig HD a few years ago. That seems like a joke now.
I say bring it on and we'll figure out how to fill it up.