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Imagine if a man had 3 wives at the same time then started casting them out on the street with their particular children. There would be an uproar.

Only for a little while, then that, too, would become a way of life.

Same as we used to have an uproar when a man tossed his wife and kids out on the streets, before divorce laws were liberalized, making your'serial polygamy' the current way of life.

There are many places in the New Testament that rule this out, and none that permit it. If one takes exception to the words of Paul; or cries "later additions", then try some thing much more deeply embedded:

Matthew 19: (NIV)
4 "Haven't you read," he replied, "that at the beginning the Creator 'made them male and female,' 5 and said, 'For this reason a man will leave his father and mother and be united to his wife , and the two will become one flesh'?

Note that it does not say anything about more than one wife; nor that more than two become a conglomerate. In fact, two women "becoming one flesh" would be an abomination, since it would also imply and support lesianism.

Luke 14 (NIV)
26 "If anyone comes to me and does not hate his father and mother, his wife and children, his brothers and sisters-yes, even his own life-he cannot be my disciple.

Note that "wife" is singular, even though in the Greek, "brothers" is plural, implying strongly that a desciple...follower...is monogamous.