The future of gaming phones proved to be a more divisive topic than we anticipated the final result is nearly even, a 47/53 split in favor of no, gaming phones do not have a future. At least some consensus seems to have formed in the comments.
To succeed, these phones need two things games and hardware controls. The former seems obvious but isnt. Nvidia tried to lure game devs into porting their games to Android (to promote its Tegra chipsets), Sony is still trying to do the same. And yet sales of AAA mobile games are nowhere near as profitable as they are on console and PC.
As for hardware controls, they really are a must. Casual games are fine with a touchscreen, but more advanced games need more inputs than would fit on the screen and precision that gliding your finger on glass just doesnt offer.
The Xiaomi Black Shark comes with a hardware joystick and shoulder buttons, which is a good start. Still, companies can be more ambitious and borrow some ideas from the Nintendo Switch the portable console hit 10 million sales in less than a year and had climbed up to almost 15 million by the end of January. Most phone companies would love to see sales like that.