To those saying we don't need the big SSDs: I'm looking for a 4-8 TB SSD for my laptop. Dreaming mostly of course, although as Brian mentions there's a 4TB Sandisk in the works - however that's got an SAS interface so can't quite fit it into the laptop at this stage.
Why might I want such a big SSD as a (tech) consumer? The reason is I've got about 6TB of data (files, music, movies, and what not) and want to have it all on the same fast and light weight disk. Right now I have it split across various spindles (mostly 1 and 2 TB WD portable drives), everything doubled because they tend to fail fairly regularly. SSDs are lighter, and less prone to failure.
Some people spend $50K or more on a car and use it half an hour a day, and trade it in three years later for another one after it has lost half its value. I use my laptop 8-12 hours a day, every day. So I don't care what I spend on hardware, as long as it's useful. I know 8 TB is probably not possible to fit into the 2.5" form factor right now, but 4-6 TB should be possible. If I then have to spend $5K or more on an SSD I'd happily do that. And I'm sure there's others out there with the same mindset.
Some would say this is crazy. But why does Intel make enthusiast CPU's with the highest clock speeds and premium pricing? Because there's a demand. It may not be big, but I'm sure there's similar demand for high-end SSDs for laptops. And there's no need to re-invent the wheel. The technology is all out there. It's mostly a matter of cramming the silicon into the case and attaching the price tag. I'm happy to pay for it, because it will make my data load a lot lighter. I have a two kg pile of spindles right now: heavy and fragile; I'd rather have a single SSD - plus maybe one for backup: weighing next to nothing and speeding up my data like there's no tomorrow :-)