Hard to see that being the norm with MS pushing Smart Delivery so strongly and so many third parties jumping on board with that idea. It's like many selling both copies for $60. It just looks like NBA2k taking advantage of the people that blindly buy the same game every year.
To be honest that would make more sense them pushing Smart Delivery because if next gen is $70 then people would buy current gen for $60 so they can get net gen for free. Its good marketing to sell through current gen stock. If that makes any sense