The gulf in wealth inequality in some countries is as bad as it's been since, well, the 1920s and before. Which generation do you mean? The never-ending one since 1914? The generation of 1874? It's absence of records pre-C19th which really hinders anything but educated guesswork prior to then. But I'd suggest a slave in the Roman Empire, a serf in the Middles Ages etc etc. would wonder why Jesus forgot about them if this can only apply in the year 2015.
I'd be a little more convinced if Jesus had predicted climate change as a result of industrialisation. But he forgot that part in his 'signs'. He'd have saved far the lives of far more people if he'd remebered to mention bacteria and viruses to someone too.