Sure but if you want functional for work, isn't a laptop pretty much always better?
Just as a laptop can never replace a desktop for many people, a tablet will never replace a laptop as well.
While it's possible to do many tasks that don't require much in the way of functionality (Email, browsing, watching movies, some gaming) it's still impossible to do other things (Writing long articles, more in-depth design, programming).
There are also a lot of other shortcomings to using a tablet to replace a laptop or desktop:
Low Storage: The highest storage you can get currently (For consumers) is 64GB, and possibly microSD (Bringing it to 128GB). With just documents and critical files alone, I have over 128GB worth of data, and most of that is not stuff I'd trust in the cloud. Also cloud storage isn't always dependable, and requires a decent connection speed.
Profiles: Most people will use their laptop for just personal use, but many people also share it within their family, which brings up the issue of needing individual profiles. While it is possible with Android with SwitchMe (
https://play.google.com/store/apps/details?id=fahrbot.apps.switchme requires root) it isn't supported by other platforms.
Multi-Tasking: Android currently has the best current implementation (I say current as WebOS is pretty much dead, and I have little faith in HP in reviving it as a true open source project, with the action being more to save face) and there is much that is lacking with it. Until there is more cohesive multi-tasking, there isn't much possibility of turning a tablet into a productive device.
Productivity Tools: Things such as text expansion/replacement, automation, scheduled tasks etc are pretty much impossible to do on almost all platforms (Everything but text expansion is available on Android with Root, and text expansion is offered by 4.1's keyboard) making true productivity difficult.
Office Suites: There are a few available, but most really aren't all that usable, and without a keyboard dock it's a hassle to do more than basic work in them.
A lot of these issues might be covered with Windows 8 tablets, but the system is going to be very locked down, so it'll still have some flaws. Also many things come down to space availability; tablets are getting thinner and thinner, and are already at their limit in some cases. While a lot of the technology is available, most of it hasn't been put in use with tablet computing (Or is still in testing phases).
That's not to say these problems will not be addressed in the future (I'd be surprised if they were even issues within 5 years or so at the rate that Google and OEM's address issues with tablets), but I wouldn't be surprised if tablets didn't become true productivity tools till 2020 at least.