Hawking does believe that AI will be a danger to humanity long term. The short term problems caused by near future robots is a different subject. Capitalism isn't inherently the problem. We could have capitalism and tax capital owners at a high rate, and distribute the wealth much more evenly. It's possible everyone could become capital owners and it would be normal to live off interest instead of work. Like owning t…
Start from a capitalist principle: if there's an excess of unextraordinary labor and a shortfall of jobs which will trade that for food/shelter/goods/etc, how would one take advantage of and simultaneously alleviate the supply/demand imbalance? By vertically integrating -- directly turning unextraordinary labor into food/shelter/goods/etc. This has been tried, they're called "communes," which is funny, because we started with a capitalist principle and wound up at a communist principle (people owning the means of production) while the popular dogma is that they're incompatible opposites.
In any case, communes have a bad rap for a good reason. They're hard. Economies of specialization and economies of scale are very real, and historically communes have had a tough time competing with the "job+apartment+supermarket" combination. I'm pretty sure that won't be the case forever: the "extremistan" economy is leaving more and more people behind while technology of every variety is advancing and (presumably) making extreme vertical integration more and more feasible. There has to be a crossing point.
The real question is "when?" It won't be obvious -- even once we have passed the tipping point, there will be a huge amount of friction. Putting together a decent commune that embraces modern modes of production will require significant risk and a huge chunk of capital (recouped with entry fees, presumably, since if it was able to more efficiently produce something already valued by the market why not just go into business doing that instead?).
But once the business model is proven, it ought to scale nicely. Communes compete with each other and with the traditional job+supermarket on social contract, each one providing a lower bound for the other. Which is important, because for all the blathering on about how traditional capital markets are based on consensual transactions, mutual benefit, and value creation, they seem to do a fantastic job of making life a living hell for a huge number of people by repeatedly un-fixing already fixed problems (like how to feed and shelter ourselves). And the world is certainly no stranger to communes gone awry. But maybe, just maybe, if they're in direct competition with one another we'll get to see them both on their best behavior.