WFang :
One of the possible (even likely) and scary outcomes of Quantum computing (like any significant leap in technology) is that it very well could drive further socio-economic separation class divisions.
It won't be hardware that drives it, but software. Hardware manufacturers have a strong incentive to drive the price down to reach the masses. There's an old saying, "if you serve the classes, you live with the masses. But if you serve the masses, you live with the classes".
But there's a caveat here. The rich can afford to buy into highly specialized software that plays the stock market, optimizes corporate profits, replaces engineers and middle managers, etc.. You can expect the first people to get quantum computers will be the likes of Goldman Sachs, Monsantos, and various hedge funds. With that software, the big guys will squash everyone else like a bug on a windshield.
We're on the brink of a revolution that could put as many out of work as robotics did. And a rise of an unfair advantage in corporate competition. 40 years from now, a bachelors degree in engineering or an MBA won't be worth squat unless it's from a ivy league school. Much like a H.S. diploma is now.
You can rest assured that if someone wanted to use it to play Crysis, it would soon beat your butt in every way. Just be thankful nobody figures out how to make money by beating your butt in Crysis.