I don't think games have gotten "easier," per se, but they have changed. All those older games that we play now and they seem so much harder than our modern games, they aren't hard more than they are designed for repetition. The games they stuck in arcadesin the eighties and nineties were designed to eat quarters, so most of them required you to persevere at each challenge before you could overcome it. They weren't hard so much as they wore you down through attrition, requiring you to put more money in to grind through the challenge.
Today, with that requirement gone from most games, they don't have to be so unforgiving. The developers don't want you to keep dying so you keep paying; they already have your money. In fact, now they want you to get through the game faster so you can buy their DLC and add-on packs and such. So, if you want to say that has made games easier, I guess I won't argue. But realize that it's not because people are lazier, it's because the market strategies have changed.
That said, I think that as a culture we are better at games than ever before. I hadn't played Timesplitters 2 in a couple years before I decided to put it in today, and I was actually better I have ever been. I tried a few of the challenges and started beating my previous high scores. So yeah, even by playing different games I have become a better player of this one. And now that more people than ever are at least casual gamers, and the gamers of the eighties have grown up and now have gamer kids, we are becoming a more video game literate culture. So I actually foresee a rise in general game difficulty in the near future, as more and more the highly skilled gamers become a real force in the market.