If we're just talking about ARM-based systems, I don't know why you'd say there's better hardware out there than Apple "forces you to use". The only thing that I thunk could be qualified as better is a Tegra 3 and that's only on the processing side because its a quad core. The 543MP2 is better than a Tegra 3, let alone a MP4.
I'll probably try a windows slate. I think , with regards to windows, the evolution will be X86 laptops that run the full version with detachable LCD's that have all of the ARM bits for table uses.
But in the next 10 years it won't matter what hardwar is in most people's computer. Everything will be done in the cloud for most people.