Again, there are other PCs with the same amount of storage, and people find uses for them. Put Office on there and a very large number of people would find they have everything they need/want. I think most people will want/need more, but that does NOT mean there's not a market for the 64GB model.
And after a year's worth of Windows and Office updates where did all of those GBs go? Let's not forget Windows 8 store apps aren't the slimmest of applications. Sounds like a lot of regular hard disk grooming to me. Unless of course they're assuming people will upgrade these devices like iPads every year...