One of the points of the article is the exact opposite. Some places get less sun, but overall the disparity between the haves and havenots is a lot less than for fossil fuels. That it's decentralized is one of the strengths of renewable energy. Amory Lovins referred to this as "no instrument plays all the time, but the orchestra creates beautiful music". Not to mention that countries want to be energy independent, which would be another improvement to the situation we are currently in.
Making wars unprofitable doesn't prevent all wars. That approach is stupid.
However, making war less costly (for the victor) could well cause more wars. I believe that before WW I many a war of conquest was initiated by states hoping to profit. WW I was thought by many states as another great chance to profit, but it turned out that mechanization of logistics, and artillery, meant the toll of war was much lower.
Besides, the 'ospolitik' was more about building relationships and mutual respect than an attempt to affect the cost-revenue analysis of war.
