Younger generation is obsessed with nostalgia for Aero/Glass and that whole era's aesthetic. It will definitely become a trend, if not for that then because Apple did it and the industry has lost all innovation outside of "copy whatever Apple does."

As a fan of aero, I hope Google copies the Apple theme with their own aero theme.

There are some places where I hope Apple improves things like legibility and contrast, but I'll take anything over the bland, flat designs of the Window 8 era.

Wow, I didn't stop to think how Windows Vista is actually quite close to 20 years old now. It and Windows 7 still feel "modern" in my mind.