This article is more about a botched implementation than about the inability for the iPad to function in an educational environment. The Apple TV problem is when mirroring an iPad 2 or new iPad. It won't expand it to the full size of the picture. This problem goes away when using apps that support video out.
All of the should have gotten them laptops people need to stop and realize what a school day is like. Laptops are useable when placed on a table or desk. They're awkward to use standing, they're awkward to use when collaborating, they're awkward to use on the floor. A tablet, on the other hand, can be used standing, sitting, lying, can easily be passed around, has no battery issues, etc.
Typing long form on the screen is not painful nor difficult. In fact, when I sit down at my computer, I miss all the autocorrecting. I've heard from teachers first hand on how much more productive their students became when they were issued iPod touches. Students that would not write more than a sentence were now writing paragraphs for their teachers.
When talking about Android vs iOS, it's the apps where Android falls down. I have my Nexus 7 tablet, but where is TweetBot? Garageband? iMovie? Pages? Keynote? There are so many content creation apps for iOS, especially in education, Toontastic, Sock Puppets, StoryRobe, Flixlab, Creative Book Builder, etc.
I have ICS installed on my HP Touchpad, I have my Nexus 7 tablet, I have Gingerbread installed on my Droid. The apps aren't there for me to integrate them into my daily routine. I use my iPad and my iPhone every day. Usually Textastic on my iPad for programming and iSSH. Depending on the situation, I'll use my bluetooth keyboard or just type on the screen.
Just because it won't work for you doesn't mean it won't work for someone else (along the same lines, just because it works for me doesn't me it won't work for someone else).