very limited market for this kind of application. wouldn't make sense for Apple to pour resources into such a tiny return.
you clearly do not understand basic marketing. the market wants cheaper smaller faster devices. a 72" iPad is going in the opposite direction.
You sound like the comic book guy from the Simpsons.
"You clearly do not understand basic marketing". If you know so much how come I'm about to turn your own point against you?
I don't know whether you've noticed, that while the market DOES wants cheaper smaller faster devices. Screen sizes have been increasing.
ipod>iPhone>iPad
iMac CRT (15")>G5 iMac (20")>27"iMac
I'm not including, MacBook Pro's and Apple Cinema Displays.
This isn't just with Apple products, look at TV's, screen sizes are getting bigger but the other components are getting smaller and in turn making them thinner.
Apple have stated they are NOT making a screen smaller then the iPad (other than the iPhone), but we have the belief iOS will transition to the iMac and so forth. But Apple haven't ever denied larger screen sizes or coming.
LOL that 72" is a DLP

.... totally different kind of technology bro. Samsungs largest flat panel is about 65" I believe and costs around $6k. A touch screen panel of 72" would cost a stupid amount of money.
Wow, I somehow have to defend every price point thrown at me, even the ridiculous ones, somebody says the price will be $30-$50K and I say no, it got to be cheaper. Everybody figured the iPad was going to be $999 and it wasn't.
If a basic 9.7inch iPad is $499 (which already includes their generous margin remember) then it stands to reason that multiplying the size by four would put the 36" version around $2000, 72" at $4000. This doesn't include component deals; buying in bulk or on the flipside, increasing the price slightly to machine a 72" screen which some technology companies already do. I'm not trying to reinvent the wheel. Merely upscaling Apple's current train of thought buy using already existing technology and repacking it.
I'm also not saying Apple will do it tomorrow either. Prices will fall over time.
So...
I agree with OP, I'd be surprised if Apple aren't seriously considering this. It is in no way a small market either. I teach in a small school and we have about a dozen or so interactive whiteboards either from promethian or smarttech, these thing cost around £2000 by the time you've bought the board, projector, projector mount, speakers and paid for someone to fit them. After all that you still need a laptop to run it. A big Apple iBoard makes much more sense.
... If we compare the current tech outlined in the above quote, to a supposed 72" iPad, which is going to be the better choice? Look at camera RED, its a ridiculous amount of money but for those coming from film cameras, it's so much cheaper and better. For us it looks expensive. It could be the same here.
I will remind everyone here that everybody at MR during certain times in the past, pooh poohed the iPod on release, the iPhone on release and the iPad on release. Now where are we.
What I'm suggesting isn't out of the realm of possibility. So don't discount it.