Each upscale method is as unique as the source material it is trying to enhance. Some methods will work better for some material, others will not. I doubt there will ever be a universal upscale method that brings peace to the world.

The challenge is to determine what method works best with the source material. SR has so far, flexed its muscles, and proven it is very much more than capable of producing fantastic results. But, it can, and will always be improved through collaborative efforts, and constructive criticism.