That's an interesting question that encompasses a use I haven't really considered. Even so, the answer to your specific question is "no" for power consumption reasons, if nothing else.
To expand, slightly, on your question, let's assume the tablet you're talking about is of the newer hybrid variety and thus capable of alternating between laptop and tablet form factors. Let's further assume that, when used as a laptop, the device can afford the loss of the two USB ports necessary to power the device (no, you can't use a hub).
In that scenario, the answer is still no, because once you get past the power issue you arrive at the question of driver availability. Regardless of what anyone tells you, this question cannot be answered affirmatively, with any real degree of confidence.
I won't get into making an actual product suggestion as I am not that dedicated, at least here, to the pro bono spirit. However, what you are looking for, to make your awesome idea a reality, is something that either:
a) (and ideally) makes use of the device's Bluetooth functionality to expand the display (preferably also enabled by a touch environment); or
b) (less preferably, for all reasons obvious) allows for the creation of either (also in order of preference):
1) An ad hoc WiFi network in lieu of Bluetooth support; or 2) A relationship between devices over an existing WiFi network.
Your idea is fun enough that I am sure someone has developed something: you just have to hunt around.