Yea, I'm with solar on this one. 2 TB seems kinda extreme. Although with the way the industry is exponentially growing hardware and software requirements, it wouldn't / won't surprise me to see that kind of thing in 8 years.
I'd also like to reiterate that we will have ridiculously more advanced hardware and network connections in 8 years. I mean, if you take a random game 8 years ago, and compare it's system requirements with those of today, it's an insane contrast. For example, Rome Total War was an awesome rts game released in 2004. The requirements to run that game were about average for the time, maybe a slightly greater demand for a higher-end cpu (being an rts and all), but take a look at the requirements:
CPU: 1ghz (Windows 7 won't run without at least this)
RAM: 256MB (I really don't know anyone who doesn't have at least 4x this in their machine, even old people)
HDD space: 2.9GB (IIRC this was kinda steep as well, the original game had to be installed from 3 or 4 CDs, and later the gold version would be installed from a DVD)
VGA card: 64MB, directx 9 compatible
So it's all relative to how you look at things over the years. A 2TB space requirement game sounds beyond obsurd now, but 8 years from now? We'll see.