I read on this forum how apparently Sega used psychology t make Nintendo look like it's for kids, and I thought of an advertisement that may counteract that:
The purpose of the advertisement would be to show that Nintendo is and always has been for all ages.
First part: have a 6 yo young boy-like Mii be playing on a NES, a variation of Mario bros themesong is playing
Second: Mii now looks a little older (maybe 11ish), is now playing a SNES and theme song is maybe more like Super Metroid
third: Mii now looks like a teen (with the spiky hair or something), playing a N64 and theme song is maybe Super Mario 64
fourth: mii now looks like a young adult, and is playing a gamecube with a girl Mii that loos similar age. maybe Wind Waker (I know it's single player)
fifth: Miis are playing with one or two 5 yo looking Miis, theme song is either Mario party or Mario galaxy
sixth: Miis all look a little older. All Miis are playing Wii U, with another 6 yo Mii holding the Gamepad. maybe a remix of Mario Bros is playing?
closing scene would either list all consoles (or the name of each console is listed in it's scene) with a closing remark of something like "Nintendo: it's for life"
I know it sounds a bit corny, but I think there could be something there.