I think we do care, it's just a matter of "nothing you can do about it". Prices dictate how these things unfold. I think the other thing is, 64GB is a very feasible amount of memory for most people. Even people with huge music collections. Personally, I have a 32GB touch, and my full music collection is around 55GB, but I manage to make it work. People can make 64GB work even more easily.
So, yeah, we care, everyone wants more storage, it's all about storage. But you have to choose when to give up the fight as to not make yourself crazy. And think that explains the lack of "why not 128GB!?" threads.