@Bas: the problem is not the name itself, and it's not even the fact that "Metro Style" is getting retired; all perfectly understandable. It's just that all this sounds incredibly cheesy...

"You should not use 'Metro Style', that was a beta name and is no longer current. You should use 'Windows Store App' instead... it's long so you can make a little tap-dance every time you say it. Oh, and could you please wear this Bing sticker on your forehead while you are at it?"

Luckily, this won't last long. People will just ignore the official lingo and call them "Apps".