I got modded down a few times here (unsurprisingly) when I mentioned who needs more than 1 TB besides some niche use. Everyone and their brother went on how creating a NAS from scratch and their database project at work was average Joe stuff and I didn't know what what I was talking about.
I think the Steam hardware survey is a pretty good indication, of the people on steam only 23.5% have >1TB disk space. And they're probably way above average as the average officer worker (no, not you with the MSDN collection and 14 VMs) sure doesn't use that much, nor the kind of people who could use a Chromebook. The "problem" for HDD manufacturers though is that they've killed any interest in anything but $/GB. The most typical big media people have is video and it's accessed linearly and for that hard drives work just fine. Everything else you can put on an SSD. So the incentive to invest is really, really low.
I guess same reason we should be seeing 128 gig ram machines but are not. Simply there is no market but it could easily be done today
Yes, I looked building an 8x8GB rig back in end of 2012 when the RAM market tanked but couldn't really find any reason to. In fact the 4x4GB RAM from 2011 is pretty much the only component I kept when I upgraded last year. By the way, for $2-3k you can now get an X99 mobo, Xeon E5-2603 and 8x16GB DDR4 Reg/ECC RAM but unless it's all about the RAM performance will be very anemic. But I haven't even found the incentive to bump it up to 32GB yet, which I could do any time. It doesn't exactly help that prices have more than doubled the last 2-3 years.