No you actually are terrible at this. Saying the 7970 has been a long running card is no blanket statement. Saying based on its performance and the fact it is still the same architecture would lead one to believe that the likelihood of newer cards may too last a while is not a blanket statement.
Let me tell you what you are doing here. You don't have an argument, at least a valid one, against the 390 having the greater possibility of longevity so you try to make any argument to that fact seem mislead without any counter of your own. Sorry mentioning the new tech in a product does not necessarily speak to longevity. Even I conceded that the 970 could (pay attention to the word could here) actual last longer than the 390, simply because: we aren't psychics so no way to say for sure. But based on simple logic and trends the 390 has the upper hand in this discussion as it pertains to longevity. Hell most posters here seem to agree.
And by the by I know plenty of tech and how GPUs work more than enough to answer most questions devoid of bias, whereas you seem to lack that ability.
So unless you have something of substance I will consider points made and move on.
Do you want me to calculate the specs out based on resolutions and then compare that to different games? I think you should do that, just like why you don't understand what a half node is vs a full node and the differences of the two.....
As I stated before, go do some work on your own and you will see why certain things happen.
Just because your screenname is JustReason, doesn't mean that is what is going on in your head.