Without knowing the demographics, we can't know for certain one way or the other.
HOWEVER, consider the following:
- Apple most likely has performed some amount of market study via focus group or other mechanism to understand the needs/preferences of its overall consumer base (not just the propeller heads who hang out on MR and/or follow Tech writers). Accordingly they likely have a sense of the real world viability of the 16GB units among the entire customer base.
- Apple's product teams want to see their products succeed and won't intentionally try to anger customers. (noting that there will always be some layer of customers who would cost more to please than the revenue they'd generate; better if they're not customers)
- Given the above two points, the existence of the 16GB tier suggests Apple believes the 16GB units are viable to its customer demographics.
So far Apple's been pretty good at succeeding despite the MR naysayers and others. Remember all the hullabaloo about 16GB units last year? Or how 1GB of RAM was so crippling? Sales figures suggest the majority of the market just simply didn't care.
MAYBE Apple is wrong this time around. Time will tell and the market will speak its mind. I still think Apple probably has a greater level of market insight than MR commentators or many tech writers if only because Apple has far deeper pockets with which to pay professional market researchers to find out the reality rather than relying on their opinion.