While I agree with your main point, the iPad style tablet has replaced laptops for a large number of people. To use your analogy these are the people who were trying to drive in screws using a hammer because the screwdriver hadn’t been invented yet.If that's true then Apple had better be ready to concede the education market to Google. It's not the first time they've done something stupid and lost the education market, their '80s education market failure was epic.
An iPad (or any other tablet) is not a replacement for a laptop, and never will be. Something may replace laptops someday, but it's not going to be a tablet.
In short, you are assuming that laptops was what was always suitable for schools in the first place. I would argue that laptops were used because really, what other choice was there at the time? Personally, I see tablets as having a lot more potential in the education space, due to its portability and form factor. Lessons should be more than simply typing away on a laptop form factor on a desk.