I agree with this opinion.
    Nowadays, the world changes too fast and people are in an anxious social because every moment there is competition and war. For example, some places in the Middle East was poor but peaceful in 1990s. However, they found a lot of oil resources there in the beginning of 21 centuries. Since then, many countries such as America and Russia wanted to get some "free offers" from there. So they begin to find some excusion to agitate war with Iran and some other poor countries results from they can getting benefit from this.Those countries which is robbed changed so fast that it has already push them to danger, which means they are less happy than before. And it is developed countries which change as fast as those Middle East country that won lots of the wars and get a lot , which means they are less satisfied because they want more. 
    In my life, I also realized that I am less happy than before. A few years ago there is no mobile phones. At that time, friends was cheering each other happily when they met together. But what about now? My classmates and I have a party together but no one actually say a word. Everybody is being busy with their games. It is terrible!
    Besides this, with the tremendous changes in science and technology makes us depend on it. We never think that this product is good enough, we don not need to improve it at all. Actually, we all hoped that iPhone could invent a new kind of phones, programmer could make more interesting function and so on. Because of the quick change, we are getting less satisfied.
    That is why I agree with this point of view.