(Still compelling!)
To be fair, 2.5kW does sound too much for a single 3x3cm chip, it would probably melt.
Yeah, though I suppose once we get properly 3d silicon I would not be surprised at power rating for that, 3cm^3 would be something to behold.
With these speeds you can run it over USB2, though maybe power is limiting.
But sure, the next generation could be much smaller. It doesn't require battery cells, (much) heat management, or ruggedization, all of which put hard limits on how much you can miniaturise power banks.
But as you said, the next generations are very likely to shrink (especially with them saying they want to do top of the line models in 2 generations), and with architecture improvements it could probably get much smaller.
Nowadays, your average cellphone has more computing power than those behemoths.
I have a micro SD card with 256GB capacity, and I think they are up to 2TB. On a device the size of a fingernail.
The form factor should be anything but thumbdrive.
I haven't had my coffee yet. ;)