Probably no need to worry about the moaners actually, most of them wouldn't load an addon textures pack anyway as they prefer to play with a single texture layer at 640x480 resolution...

May well work for many textures. Units I suspect are the most problematic, clearly the originals where quite heavily optimised down to 256x256, lots of unpleasing things become apparent when you scale them back up. Ivtank00 for example, the tank is not UV mapped correctly on its underside, its just black, even A tiny bit of noise or pixelation caused ugly triangles to appear, so without some work on the model the underside has to remain pure black.Programmatically upscaled textures would look pretty close.
Trying this out...http://photocomix-resources.deviantart. ... -100248242
Wow, it works really well, good for getting rid of pixelation and smoothing stuff out.