If the iPad 3 will have the reported goods (LTE 4G, retina display, quad core, amazing OS) it will make the already lagging competition look ancient in comparison! There will be no substitute upon release!!
I think Apple has solidified their position for the foreseeable future. Look at the iPod, the iPhone, and even the iPad itself. They make products no one can compete with. Even when people see competing products they associate them with Apple.