I tried this as well 2 weeks ago. The OP has a much more comprehensive breakdown of why it didnt work than I do (and a much more involved workload than i was intending).
Personally and in my conversation with folks, I find that as a productivity device, iPad users fall into 2 buckets.
Bucket 1: Creators: developers, designers, writers and such - folks who need to create documents and other work product. Broadly speaking, in terms of available apps, and interconnectivity with apps (eg leaving Photoshop to go research something in a browser and coming back, copy paste workflows etc) the iPad is simply not there yet. For stand alone workflows, it goes some of the way there (Eg if all you're doing is writing, you can probably get away with it), but if your role involves using several tools, the tools simply arent there yet.
Bucket 2: Decision makers. I know a few successful CEOs who only work on an iPad. For them, most of their workflow is digesting data and decision making - they arent writing code or making slide decks. They just process emails, do product review and look at data and conclusions. For them, the iPad is perfect because all those workflows are easily completed on an iPad.
I think the iPad will get there eventually - the type of creation that is done will shift somewhat, and the tools will get better, but for now, even the most dedicated folks have a hard time using an iPad exclusively.
I don't think we'll get to a point where professional or enterprise level creation happens on an iPad, outside of typing text or filling out forms (if that even counts). Apple's direction with the iPad is purely as a device for buying and/or consuming data, and will maintain as much control as they can.
There are iOS mods (jailbroken) which currently enable keyboard commands and mouse use for the iPad right now. Multitasking is a big weakness that other tablet OS's are addressing or moving in the direction to address.
Let's hypothesize a 25" tablet, suspended from a monitor arm, with support for keyboard commands, mouse, and multitasking. That is effectively a desktop. The downside is processing power, which I am assuming will continue on an exponential upward trend in addition to seeing CPU intensive processing offloaded to remote servers (compiling, rendering 3D images, converting video, stuff that already is often done remotely today.) The part of this vision I find hardest to believe is a 25" tablet, so I assume it will have to wait for an advance in display tech leading to lightweight/fold-able/roll-able/etc.
Sure, Apple is going in one direction today, but if iOS falls too far behind the feature/usability curve their tablet dominance will fall.
> I don't think we'll get to a point where professional or enterprise level creation happens on an iPad
I agree with a caveat; professional/enterprise level creation looks the way it does today partly because of the tools we've had available (Word, Excel, etc). Where I disagree is that I think professional/enterprise level creation will look different in a way that benefits the iPad (this is really hard to quantify which is why its so vague) but, put another way; creation tools for the iPad will be developed, and their outputs will be some alternative (to word docs, powerpoints etc).
Personally and in my conversation with folks, I find that as a productivity device, iPad users fall into 2 buckets.
Bucket 1: Creators: developers, designers, writers and such - folks who need to create documents and other work product. Broadly speaking, in terms of available apps, and interconnectivity with apps (eg leaving Photoshop to go research something in a browser and coming back, copy paste workflows etc) the iPad is simply not there yet. For stand alone workflows, it goes some of the way there (Eg if all you're doing is writing, you can probably get away with it), but if your role involves using several tools, the tools simply arent there yet.
Bucket 2: Decision makers. I know a few successful CEOs who only work on an iPad. For them, most of their workflow is digesting data and decision making - they arent writing code or making slide decks. They just process emails, do product review and look at data and conclusions. For them, the iPad is perfect because all those workflows are easily completed on an iPad.
I think the iPad will get there eventually - the type of creation that is done will shift somewhat, and the tools will get better, but for now, even the most dedicated folks have a hard time using an iPad exclusively.