What does Genesis 11:6 mean?
After seeing the city and the tower that the united people of the earth had built, God does not dismiss their efforts as weak and futile. Instead, He acknowledges that by working together, humanity would can accomplish whatever they set out to do. This, of course, leads to an immediate question: why is that a problem? Why would God stand opposed to such unified productivity?The answer is in mankind's capacity to turn gifts into curses (Genesis 3:17–19), and abilities into abuses. The flood had not changed the nature of sinful human beings. God's observation in Genesis 6:5 still applies to the hearts of humans left to themselves: "The Lord saw that the wickedness of man was great in the earth, and that every intention of the thoughts of his heart was only evil continually."
A powerfully united humanity, inclined to do evil, could accomplish great wickedness. No matter how perverse, outrageous, or ridiculous something might seem, mankind can and will attempt it, given the opportunity. The following verse reveals that God has no plans to give humanity that kind of opening.