Really interesting. As with a lot of futurism he doesn't go into a lot of detail on why some things are unlikely to happen anytime soon (like a dyson sphere, I can't see that being feasible in the next hundreds of hundreds of years). But he had some of the most interesting refutations of people just saying essentially that we can't survive here that great now, how will we when we live a long time.
That all being said I always think its a good idea to say in articles about life extension that although cool advances in medicine and energy and food production are likely to happen within the next 50 years, it is unlikely that any sort of extreme increase in lifespan will affect anyone that is an adult right now. (Although possibly our grandkids) Without that disclaimer these types of articles often seem like wishful thinking.