True. And no one really has to own more than one pair of shoes. No one really has to go on holiday. No one really has to go to a football game, attend a concert, go to the pub or the cinema. And yet they do. Predicating your argument only on what people have to do is to ignore human nature.
No one has to own a house. But I know many 30 something couples with young kids who want to. They want to put down roots and create a long term home that their kids will grow up in, and not have to leave at the whim of a landlord. They want to choose a location that is close to schools and know they can stay there for as long as their kids are in school. They want to pay down a mortgage and to own their home outright before they retire so they don't have to rely on investments to pay the rent in their old age. They want to pass on an asset to their children. These desires are perfectly legitimate, even if you do not share them.
The simple solution is to create a legal and tax climate where people no longer want to buy a house because their needs are met through renting - long term security of tenure with built in ceilings on rental increases and with the balanace of power firmly tipped towards the renter. A tax environment that makes home ownership a very expensive luxury and which will reward investment in small and medium sized businesses. This is exactly the situation that exists in Switzerland - the population there invest their money in thriving Swiss businesses and rent throughout their lives. The government actively discourages home ownership through taxation. The only people I knew who owned their own homes in Switzerland were foreign tax exiles. Its also interesting to note the shift in attitude in Ireland (which has the highest levels or home ownership in the world) - where mortgaged property has gone from being considered an "asset" to rightly being seen as a liability.
It would be very easy to change the attitude of the population from pro home ownership to pro renting with a few straightfoward changes to the tax code and pension arrangements. Just think of all the billions currently being "invested" into unproductive property that could be use to finance businesses that actually create and produce things...