Not in a world of tablets.
USB monitors are hardly a new thing, but most of the ones I've played with are extremely unpleasant to use. Build quality is low, display size is small, responsiveness is crap. Toshiba's reputation for solid products is the only reason their new USB monitor is making headlines. Their 14" Mobile LCD Monitor may be the ultimate product of its kind.
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It features a 1366 by 768 HD resolution and front controls to alter brightness or adjust power settings. The monitor comes with its own fancy carrying case / stand, and it draws its power entirely through USB. All in all, it's not a bad deal for $199.99.
Unless you've got an iPad. Or any other tablet, really. Apps like iDisplay allow your tablet to act as a secondary monitor. Most of them don't even require a wired connection. Sure, you lose out on a bit of screen real estate. But you also cut down on your weight.
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Toshiba's USB monitor weighs an uncomfortable 2.8 lbs. The iPad 2 only weighs 1.3 lbs. Samsung's Galaxy Tab 10.1" and 8.9" will have access to apps that function the same way, and they'll weigh even less. To be fair: you're spending an extra $300+, but the added functionality more than outweighs the cost. At this price and weight, Toshiba's USB monitor is a niche product at best.