Metro in itself isn't a terrible idea. Especially the idea of having a reduced runtime that can work across mobile/tablet/desktop. The poor idea was forcing full-screen on the desktop. Now that they're going back on that idea, by implementing the Start menu, allowing Metro apps to run in windows, and more properly integrating Metro with the desktop, it might actually be usable.

Before W8 was released, Metro may have just been something Microsoft was pushing. Now, however, developers have released third-party Metro apps, and people have these apps installed. Do you think Microsoft would unceremoniously disable access to every Metro-only app?

There is a difference between "supporting third-party metro apps if necessary" and "putting links to metro apps that have desktop-style equivalents all over the start menu"