Communes and kibbutzes can work on a small scale because 1) it becomes progressively more difficult to find a common vision and purpose as the size of the community grows, 2) participation in the collective is completely voluntary, and 3) people have the right and ability to leave if the collective no longer shares their goals. None of this is true under your Utopian theory. Those who find themselves out of tune with the collective consciousness must be coerced, shunned, or banned.
Don't forget killed!
"Communes and kibbutzes can work on a small scale because 1) it becomes progressively more difficult to find a common vision and purpose as the size of the community grows, 2) participation in the collective is completely voluntary, and 3) people have the right and ability to leave if the collective no longer shares their goals."
No wonder the kibbutz system is dying in Israel. Most of them have turned capitalist -- for the very reasons above.