n0ns3ns3 :
With technology advancement, things tend to get cheaper to produce. So take into account inflation and whatever, you still supposed to get cheaper product.
That's not really how it works. Yes, the cost for a given performance level should go down. Which is why we'll be seeing Polaris/Pascal GPUs with performance on par with the GTX 970 for cheaper than the 970 was. But that's not the same as saying that each generation of GTX x70 cards should be cheaper than the last. That wouldn't make sense, as eventually a GTX x70 would be end up priced down to a ~$100 card, and that'd basically redefine the x70 segment as an entry level card and they'd have to come up with a new tier/naming system for their higher end cards.