Upscaling a SD video and adding frames to make it 60 fps interpolated, (sorry is someone feels ofended) that's bullshit.
It has no sense, you won't get better quality by doing that, you will just get a bigger file size.
The reason why there are old films restored to HD/4K versions and they look really good, it's because those films (of big studios, with big budget generally) were recorded in 35mm, 65mm and 70mm films stock, the way image was saved in those films stock was completally different from actual digital cameras.
But if you don't have those original films stocks, you won't get better quality from an DVD image.
The best you can do, as eobox91103 says, is to let televisions use their own system to adjust the image, if the video you're playing has good quality (for example a well encoded SD video from a DVD source) it will look better than those upscaled videos, even if it's not HD.
(Hey AOS, good to see you here too)