Does the industry consider the mid-gen upgrades (PS4 Pro and X1X) successful?

[Bofferbrauer2]

For them, probably good enough to do a repeat.

It allowed the current gen consoles to somewhat keep up with mainsteam gaming PCs, which would have left the current gen consoles performance-wise totally in the dust otherwise. When the PS4 and XBO launched, they were already just at the performance of mainstream PCs and couldn't hope to compete with the high-end in raw performance, so a mid-gen upgrade was needed from the get-go to keep them alive, and the emergence of affordable 4K TVs gave them right excuse to do so.