Besides, it's not dated. It's ignorant to think that human beings have somehow evolved past the point of private property. If anything, we've greatly regressed as a society and need the protection more than ever.
The only basis for someone at this point to argue against property rights would be bred more out of frustration of their own inability to prosper and acquire property, either through internal or external forces, rather than a true belief in community. Give a communist a million dollars and a mansion and I'll show you an instant capitalist.
Humans will never evolve past sex, as they will never evolve past private property.
Even the staunchest, most hard core of communists or socialists still want something to own and define as being theirs. Private property is innately built into us, it's the quintessential expression of the individual.
In the end, we all want shelter, we all want comfort, we all want luxury. How we go about attaining these things is what differs, but one infringes upon others to satisfy the needs and whims of an individual, while the other relies on the individual to make do for themselves.