I see tablets replacing most enterprise pcs in a few years. Most of the ones I've dealt with and worked for already deploy laptops to their employees, it's the next logical step in cost/function.
That is true for the most of what I'm experiencing as well.
I can take my company as an example. We are by no means big, but we have a lot of different needs for each department.
For the production part we only need medium powered desktops. This will not change one bit. There will always be a need for it. Production means low cost hardware because of a dirty environment etc.
For the technical departments that do cad applications laptops are more ideal right now. But the cost isn't really justified for the high end hardware, at least how I feel. A really good desktop at more then half the prise can do a better job here. For the last 5 years laptops have taken over. For some that is working fine.
But replacing a laptop with a desktop, and then add a tablet in there, would cost a lot less actually. The power needs when working at home can be solved by letting them remote control their desktop via VPN from their tablet. Sure dependent on the internet connection. But for most this should not be a big problem. In any case few will work at the same time.
And for all the rest who now use laptops, tablet should be more than enough. The biggest hurdle is the limitation of a physical keyboard. But a portable one should to the trick on most cases.
Now I'm thinking more of the Win8 pro editions here. Sure Win RT could work for the really portable part of the business like sales etc.
Android/iOS isn't really ideal for the enterprise. Security is a big problem. As well as management. Sure there are solutions for it. But why use a lot of money on it when you can get a Win8 tablet and use the current solution?
I really don't understand how companies can adopt Android/iOS tablets into their environment like they do. The cost/security concerns are a bit too high imo. The market have been pushing hard for tablets so it is understandable. Win8 is the response that MS had to give right now. Surely not the best solution, but it is a lot better than the current.