Ok, first off, that car analogy has been tried a while back and it was ripped apart justifiably.
Cars aren't expected to ...
You missed the point entirely. What people expect is irrelevant, what is relevant is the products that exist and where they are on both performance & price. You can expect whatever you want but that won't make either AMD or Nvidia to satisfy your fantasies. You know why? Because when the customer goes to buy a new card for himself all these expectations about what should be or could be mean nothing, you have a range of products in front of you and you have to choose between them. Either that or give up on it entirely. There's no world in which the 480 will end up being a 8gb 980 for £200.