If Everybody suddenly decided to live in communes would that be the end of mass production?

That would be groovy man.

mass production?

No, mass production is the matter of making an item in multiples, which could from three or more.

Communes are groups of like minded people, commonly now using minimal external contact in an attempt to be self-sufficient.

BTW:  Did you know that Bernie Sanders Never Worked a day in his life, He joined a commune after graduation and was TOSSED out for being Too Lazy. He then used family money to enter Politics. Also, he latter used Democrat Funds to finance his INDEPENDENT campaigns.

Some of the most efficient factories on the planet are run in communal Kibbutzes in Israel.

and the beginning of starvation