Changes in spending can temporarily outstrip changes in income without doing any harm, but over the long run this implies an increase in debt and/or a decrease in savings rates. Unfortunately, this has already been the trend.
Most of us want to be physically fit, but very few of us are. The same holds true with financial security. As my father (and many others) used to say, "A lot of people want to go to heaven but no one wants to die to get there."