The Golden Rule

Buddhism,
Baha'i Faith,
Christianity,
Confucianism,
Hinduism,
Islam,
Jainism,
Judaism,
Sikhism
and Taoism

all share a common ethic:

Treat others as you would like to be treated.

I wonder, if for one day, all of the followers of
Allah,
Yahweh,
Jesus,
Confucius,
Buddha...

followed the golden rule...

what would happen?