amazing how few tech blabbers can grasp it is all about using the right tool for the job/situation.
unlike the tech blabbers who mainly hang out, do "social" on the web, and then BS on their websites, i do "real work" - spreadsheets, contracts, detailed memos, review designs, etc. so my work setup now is very simple: on the desk are wireless mouse/keyboard and a thunderbolt display to go with my basic Macbook (just two wires to plug in, total). on the road, i just take the same Macbook of course, which is brain dead simple to do. not a Macbook Air because the optical drive is still important because, despite all the hype about the cloud and such, the easiest and most dependable way to swap/leave behind lots of files with people from other companies, attorneys, designers, etc. on the spot is still to burn CD's and receive/give it to them (no fiddling needed with their IT or ID's or anything, can do it anywhere, and they can then be shared with others in those offices very easily too).
no tablet can ever be adequate for that, period. the screens are just too small (try looking at a complicated multilayer spreadsheet on one). and being a clumsy typer anyway, the bigger keyboard is better for me. this is why the Surface Pro is DOA. despite all the kitchen sink hardware, it's still the wrong tool for "real work." almost every business person is going to reach the same conclusion.
but when i am on my own time/vacation yet need to be able to do "light work" - mainly stay in touch and maybe review/sign off some pdf's - i don't take the Macbook any more. my iPad 2 is very adequate for this. and of course i can use it for all the "consumer" purposes too. the Surface Pro would be total overkill for this situation.
the iPad is also very adequate for quick work trips - around town or day trips out of town - when i'm not going to be working on "content," but just need to stay in touch and look at whatever. same is true for doing limited business "homework" at home after hours.
about 1/3 of our staff need a portable computer sometimes like this. the rest are desk-bound and so will always have a standard PC of some kind.
my company is small, so we don't have custom software or a massive D-base. if we ever needed to, we'd look at contracting for a custom iPad program if being portable and D-base interface was necessary. the proprietary professional software we do use is Windows-based - and it is very complex. there is no way on earth that program (which has a few dozen "modules") is ever going to be ported to a tablet/touch UI. ditto the accounting software.
so bottom line: for businesses, consumer tablets will augment but not replace computers - but laptops/notebooks ARE replacing desktop PC's for the part of the workforce that travels. not the cheap ones (i'd bet most of those are bought for students), but the better quality models, which is why Apple's sales keep growing.
for consumers tho, tablets definitely can and will replace laptops/notebooks. i won't ever buy another laptop just for personal use - that's overkill now for a portable device. (but i'll always have one big iMac at home as the base unit for everything - i got a lot of media.)