If I just saw "specialized shaders replaced with ubershaders" on a feature update, I probably wouldn't think there was much of a story to it.
Apparently their infrastructure costs are covered by the few ads on the site and they're happy to leave it at that.
They've recently started a side blog (http://emucross.com/), as well.
If you're curious, their reddit submission history (https://www.reddit.com/user/JMC4789/submitted/) has a bunch of interesting stuff.
Modern Shader cores are basically Turing Complete, so you should be able to emulate anything, including the Wii U's modern GPU. But it won't run fast enough to help, because you will have to spill some (or even a lot) of the shader's state to the host GPU's main memory.
Ubershaders work well for dolphin because the entire mutable state of the GameCube's pixelshaders fit into the available registers, with plenty of space left over.