It is easy to overlook the new and key contents in Wilson's speech. This is not because we gradually lose interest in novelty (of course, human beings did this a long time ago), but because we can't realize that we have adapted to the new environment, so we can't incorporate this into our decision-making.
So, yes, we will adapt to BMW and plasma TV, because we adapt to almost everything. But Wilson, Gilbert and others have proved that we can't seem to predict that we will adapt. Therefore, when we find that the happiness we get from one thing is decreasing, we will turn to the next thing or event, and almost certainly make another prediction error, and then another error, endlessly.
Now that we have accepted almost everything, we will adapt to life with BMW cars and plasma TVs. But Wilson and Gilbert pointed out that it is difficult for us to predict the fact that we will adapt to all this. Therefore, when we get pleasure from disappearing things, we will turn to the next thing or event, and then make one prediction error after another forever.
As Gilbert pointed out, when we encounter negative events, such as unemployment or the death of our loved ones, this kind of glitch is also very important, for which we predict a forever incredible future.
As Gilbert said, when some negative events (such as unemployment or the death of a close relative) happen, this problem of people will become obvious, because these events will make us feel gloomy about the future.