The fact is that the iPad has a huge development community supporting it and there are some very good apps available for the iPad. Take note of some of the professional people that use iPads exclusively; airline pilots (check lists etc), doctors/nurses (patient monitoring), photographers (portfolio management), lawyers (legal specific apps), the list goes on.
Whichever way you cut it, the iPad has such a strong foothold in the professional world that it's going to take something disruptive to loosen that hold. Windows 8 is not that disruptive 'something'. Nor is Android.
Because I use my PC for bill paying, banking, etc I was thinking about buying a second low level PC as a backup system but I find I can access my most important web applications on my smartphone which I now use as my backup 'system'. I actually use it when I'm out of town.
Someone needs to clean their window and maybe even open it once in a while for some fresh air, smell the roses and find out what's actually been happening in the world for some time. And talk about crystal balling: 'over half of all iPads end up in a drawer never to be seen again'.