@J - Have a quick search through the forums for a tool called Storyline. You'll find a few photos of Articulate products still in development that run on iPads. They're working on it and have projected a summer release with an update to Studio that will also have HTML5 support.
I'll agree with you that platform flexibility is where tool makers should focus. Stuff should run anywhere in some capacity, even if it only runs great on a few select platforms. I do wonder, though, about demands that tool vendors support scalable outputs so it'll run on a closed and controlled device from another vendor Seems a little odd to me.
I personally wouldn't choose or recommend the iPad for deployment of content to my organization for just this reason. It's neat. I have one. So does my wife. My experience with mobile support deployment tells me most of them end up on a shelf or on a trash heap after a year. There is just enough closed control to the apple device to make me believe this cycle could be accelerated. I hope this changes. There's great potential in mobile deployment for learning and performance support.