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I think it would be really cool if they were to introduce Shinies to Go, and I'm surprised I haven't thought about that. It would bring more people back to the game. Another reason it would be a good idea is because since you see the actual Pokémon before battling it, it would be easy to just tap on it the second you see it.
INTRODUCING BRAND NEW ITEM! Shiny Balls! Get 5 for 200 PokeCoins, no available in pokestops and has a relatively better chance at catching Shinies! YAY
After the changes they made on the technical side, and the temporary addition of the christmas-versions of pikachu and raichu with the red hats (a red hat pikachu will evolve into a red hat raichu), they could add them immediately.
But there is no way to know if or when they will do it.