As I have mentioned before, the PS4 is getting Horizon next month and that game is gorgeous. All you are doing is saying that at some time in the future the PS4 will be outdated. That's true of all electronics. It's says nothing about its current capabilities. The Pro was made for those gamers that want a high end model and are willing to pay for it. As sales have shown, the vast majority of gamers still prefer the base PS4.
The PS4 does not have to be cutting edge hardware. That is what all the PC enthusiast consistently miss. Comparing PC and PS4 2016 games on Metacritic, PS4 had 4 games rated 90 or better while PC had 5. The lack of being cutting edge didn't matter much when it comes to top rated games. What is even more telling is that the PS4 actually leads this list in graphically demanding game that push the hardware 3-2. If well received good looking games is what you wanted, the PS4 not the PC is where you wanted to be in 2016.
All these numbers jump around year to year so results will vary, but the overall point should be clear that being cutting edge does little for the PC in terms of either top rated games or top rated graphically demanding games.
Metacritic 2016 90+ games
*Graphically demanding game
PS4
- Uncharted 4: A Thief's End*
- The Witcher 3: Wild Hunt - Blood and Wine*
- Overwatch*
- INSIDE
PC
- The Witcher 3: Wild Hunt - Blood and Wine*
- Overwatch*
- Out of the Park Baseball 17
- Stephen's Sausage Roll
- Kentucky Route Zero - Act IV