If I am like many other consumers then I can tell you why. I have officially gotten away hard disk drives in favor of solid-state storage. HDDs skip (I have often noticed this while listening to long MP3s or audiobooks in the car), there is always a delay in the UI due to HD spin-up and the battery life is less with an HDD than an SSD.
I've also found that I don't need to carry 15,000 crappy songs around with me (320 kbps MP3). 32GB of quick, battery sipping storage is more than enough to carry a good deal of music around. I leave the 120GB came to my desktop listening. For all of these reasons I have retired my iPod Classic and Video.
As for the form factor of the larger devices (V5), I don't see a need for them - just like the stupid iPad. They're just large enough to not fit in my pocket or stack well with a portable amp, and they're too small to do what my netbook does.
In your case, no matter what PMP you decide on, nothing will be adequate. You have 2.5TB of MUSIC! I believe you, but here's the breakdown:
2.5TB = 2,500,000MB
If the average FLAC album was 500MB (2,500,000MB / 500MB) = 5,000 Albums!
Forget a PMP you need a small laptop.
Edited by SoulSyde - 5/17/10 at 9:52am