As much as I adored their branding during the DS and Wii era, it really is time for a new direction. The Wii has one of my favourite brandings in videogame history. Very clean and with a clear point of view. However it fell completely flat with Wii U, and the 3DS isn't much better.
Going back to the classic Nintendo red would be a good decision. At the same time, I feel the color red doesn't match Nintendo much anymore. It seems a bit harsh, makes me think of Netflix or Youtube, it doesn't really carry the friendly image. It's very utilitarian, like fast food logos often have red in them you know? Though brands like Coca-cola have been able to make it charming as well. Oh well, I'm sure Nintendo could make it work since their marketing has been on point and they show to have an idea how to market themselves in the future... I'm probably overthinking this. We haven't even seen proof of the Nintendo red returning.
I like the idea of Nintendo going gold though. Imagine that.