Maybe I just don't get it, but if the opportunity is there, then what stops an established company or a startup from making a tablet that does exactly this but

Maybe I just don't get it, but if the opportunity is there, then what stops an established company or a startup from making a tablet that does exactly this but is more flexible? Probably easier with a linux variant? My point is that this device could likely easily be replicated with a ux that treats the owner like an owner. By restricting everything so much, Apple has seriously limited its options -- especially in enterprise computing. I don't know if the tablet market will progress the same way as the smart phone os market has, but I doubt Apple has hit a home run here. I look for a "Symbian tablet" or RIM-like product to take the majority of the market share and profits.