Point it to one of the tens of programming environments for the iPad that also run on the iPad? Like this, for example:

http://twolivesleft.com/Codea/

And then I'll tell him that with just a Mac (which he might already own) and a $100 dollar subscription, he can program and even sell iPad apps worldwide, to a market of half a billion people.

People seem to forget how, in those 80s computers, to get a compiler (besides the built-in BASIC one) you usually paid lots of money. And that a worldwide distribution network for your apps, with automatic payment handling et al was also out of the question. As was an SDK even 10% as complete as Cocoa Touch or the Android one.

An iPad could be a good stepping stone. For me it was Nintendo as a kid that then got me into computer games, which then got me into making my own stuff, which then made me into a programmer today heh.