The utopia he wishes for isn't one I'd like to live in. A world without "nothing to die for" is a world that's not worth living. Countries and religions have been the cause of many evil things, but also the cause of good and great things, and it gives many people purpose and happiness.
World peace is the goal, but I don't think it should be achieved by the means of homogenizing and sedating mankind.
How many times have you actually died for anything?
Seen openly mocking people with learning difficulties.
The song doesn't preach or condemn people for having possessions, it simply invites people to imagine a better world where there was no need for them. It's easy if you try, a plush New York penthouse will neither help nor hinder your imagination.
I would love to believe in the peace expounded by Lennon in his better moments.
But often I'm too cynical to fully believe.
Great song, though.