Building efficient homes will only buy humans more time here on Earth. If we want to be serious about making it longer as a species, we need to colonize space. Not just for the extra room, but since we'll be more spread out, if some disaster wipes out a population, the species will still live.
Well... yes. But the problem is: what is the social and political motivation for it? If there is no motivation for it, how can it be created?
Redundancy in population distribution is important, but I do not see any forseeable disaster that could destroy humanity wholesale. A supervolcano eruption would be pretty bad and a K/T scale bolide impact would probably kill billions, but even then...
Interesting, although I don't think we already depend on satellites as much as we depend on crop growing & harvesting, steel and heavy industry production, and so on. I think in today's world, satellites are by far more important for army logistics, targeting and intelligence, while the civilian world would by large survive if all satellites get sweeped out of orbits one day. By the way, this is why many military conflicts scenario involve disabling enemy's space potential as part of the doctrine.
I don't know... survive, yes, but the results would not be good, and they could cause bad instability socially or geopolitically.
Intercontinental communications? Internet? What about it's use for trade and business? And weather forecasts? Could be made more problematic as well... you lose hurricane tracking data, for example. And civillian applications do make use of GPS, for surveying, and also for air and sea transport... if not essential to such transport, GPS is at least a good redundancy that encourages extra safety.
Knocking out the enemy's space capability during war would be helpful, but I think that wiping out satellites on a large scale could amount to shooting oneself in the foot if the resulting debris compromise friendly satellites.
In essense, he views the world as a rich playground and challenge set for US political and military power, and he does not believe that in century 21 there's a chance for them to get bored of having nothing to do.
So... countries are going to go to war because they will get bored?
He may not be the official ideology designer for every next inhabitant of the White House, but surely there is a grain of ideology in his forecasts. And governmental strategic analysts of different countries should be aware of possibility for affairs to develop according to his scenarios.
I see no reason for emerging powers to engage in a violent war with the US or any other superpower for that matter. A mesopower- say, Brazil maybe, taking on the US would only lead to defeat, especially if other nations allied to the US became involved. In addition, the strong ideological differences that occured between the US and the USSR are not present except with the PRC, and even then it has amicable relations with the US.
The introduction of a superpower other than the USA onto the scene could lead to tension, but that more of the sort of displays of male ego than actual armed conflict. Of course, having a more than two superpower scenario changes things as well...