It's important to note that people in his time really saw value in leaving the household life at some point in their lives. A number of kings did so late in life.
Although he was an important reformer of Indian society and its religious practices, the Buddha’s concerns addressed the individual, not the fixing of social systems.
Today is the day many Buddhist celebrate Nirvana Day (sometimes referred to as Parinirvana Day). This holiday is the day many Buddhists observe the death of Siddhartha Gautama, and consequently his transition into Nirvana.