I think one of them would be virtual reality, it would be a trend that might cause the growth of humanity to drop by half in a century and this is due to the fact that it will be more fun and even the lazy ones would achieve a lot in it, people will have virtual families, kids, cars and all.
Trust me when it gets to that, the fate of humanity might be in the hands of androids, because living a normal life would have become difficult already.