As others have said, there is not a lot of substantiation in the talk to shed new light on frequently-discussed topics.
It feels intellectually shaky to assert that the economy will go back to growing, if only the middle class can go back to spending, which we can achieve by giving more money to the government.
Here's a different and more TED-like viewpoint: Perhaps economic growth actually requires movers and shakers. The US has had a good share of them. These people aren't going to be your archetypal rich fat cats, nor your average Joe living paycheck to paycheck. If they are rewarded with wealth, that is a good thing. And sure, some of that wealth can go into a pot to use for the common welfare.
If we want more consumer spending, let's give people better things to spend money on, things that help them in their own quest of fulfillment and creating value.
If businesses are reluctant to hire, it's only because they need to make correspondingly more money to make the hire worthwhile. As we know from start-up land, many tasks can't be done better by throwing more people at them, especially creative tasks. We're still trying to solve the problem of how individuals can cooperate and merge their individual strengths towards big goals. A full-time human ought to be a very valuable asset to a company, though, and many companies can be viewed as engines that take human effort and turn it into value, creating money.
Economic growth is not to be taken for granted. It requires innovation, optimism, and positive energy that comes from individuals. There are many things rich and non-rich people can do with their time and money to help, besides just giving their money to the government. Take something you're good at and provide a service, or make something and sell it. Lend a cup of sugar to your neighbor. Earn what you're worth. Invest in good businesses. Pay someone to do something for you. And on and on.