Wants and needs are different things.
I think the evidence that people still experience wants when their needs are met is everywhere.
Whether this is human nature or a consequence of modern conditions, specifically the keynesian money circulating economy and consumer cultural norms and mores is up for debate.
I'm not thinking purely in terms of the needs which translate easily into commodities here, like fast moving consumer goods, ie food, or consumer durables, TV, laptops, music, entertainment. Those consumer norms contaminate everything else, including less tangible needs like needs for attachment, time, attention, relating with others. People try to buy those things, then with money to be made people try to ramp demand and stimulate peoples wanting.