This is somewhat off topic but I have found it mildly humourous lately that Google is building self driving cars but they chose "Google Drive" as the name for a completely unrelated product.
My brain just cognitively squished the two of them together and went "whoaa ... they're opening the SDK for the car stuff already !"
Insert obligatory rant about lack of Linux client.
Many people already don't distinguish between transient (RAM) and permanent (HD/Flash) memory. (And that distinction is only something that developers should have to care about anyway.)
So while some people may be aware of drives, it will increasingly go the other way.
As for laptops, the loss of the optical drive on thin ones is very recent, dating basically to the MacBook Air. iPads are utterly irrelevant. Have people also forgotten what keyboards and mice are since iPads started selling?
You might be right that people will eventually stop using the term drive as its currently used, but right now it's a term with plenty of recognition. And over a longer period of time, rather than the term disappearing, I see no reason why the definition wouldn't simply adapt to refer to online "drives" if physical drives truly died out.
Though, I guess there's a good argument that "Google Drive" would be what "Google" does for you... Great, now you're convincing me!