I think it maybe possible to emulate Xbox One, and PS4 games on faster smartphones in a few years since there are already some smartphones with 8GB of RAM and the CPU on some smartphones are becoming as fast as some laptop CPU. But, the video quality of the PS4 and Xbox One games being emulated on a smartphone may need the video to be set to a lower video quality, and resolution size like 480P which is similar to DVD movie quality, and PS2 games resolution.
But, I think it would take many more years until it would be possible to emulate PS4 Pro and Xbox One X games, and play them at 4K.
But, I think it would take many more years until it would be possible to emulate PS4 Pro and Xbox One X games, and play them at 4K.