Bluntly, I think those Apple proponents are engaging in 'wishful thinking'.
Now, if they want to monitor a 'Cloud' from an iPad - ok, I'll buy that. But, if they want to do serious enterprize work, the tablet is simply not the right tool for the job. I'd no more suggest heavy intensive work on an iPad, than I would any Atom based Netbook running any version of Windows. Wrong tool for the job.
The Laptop/Desktop is primarily a productivity device; Tablets are convenience and primarily leisure devices. Not saying they are limited to leisure - but their small size, lack of keyboard/mouse means that data entry has to be minimal. Simply like using a screwdriver like a crowbar - sure, you can do it; but it's not the right tool.
It's not rocket surgery to do the math on that one.