The underlying fallacy is in imagining that there is some strict segregation between "toys" and tools. When a tool is too expensive and only moderately practical it is deemed a toy. But toys of such sort can become cheaper and evolve in function and scale, becoming imminently practical in the process. Many of the most practical tools began as toys of such sort: the steam engine, the automobile, the airplane, the laser, the rocket, personal computer, etc.

Today the premier example would be mobile devices and mobile OS tablets. They have enormous potential, even the potential to replace traditional PCs, but today they are often regarded as toys.