We have Apple Stores all over the place now. If a consumer has any questions, they have a place to get to get an answer. I'm almost 100% positive that any Apple sales team member will advise a potential customer on what to get based on their needs. And most will suggest 16GB in this instance if the user lets them know how they use will be using it. While taking price into consideration.
People in this regard are not out in the wild guessing as to what to get "IF" they go to an Apple Store or store within a store like Best Buy and speak with someone.
For those that just buy online and look at only the price, well they have only themselves to blame.
It's not a disservice, its choice. You have to take some responsibility in the choices you make. Can't just say "Its all Apples fault, they shouldn't even sell this product like this knowing I'm going to buy it and get upset afterwards!".
You either know what you're going to do with it, or you go get some help if you're not sure. It's really not that hard.