Max: Although doing so would be very costly, humans already possess the technology to build colonies on the Moon.
Premises
Although doing so would be very costly, humans already possess the technology to build colonies on the Moon.
As the human population increases and the amount of unoccupied space available for constructing housing on Earth diminishes, there will be a growing economic incentive to construct such colonies to house some of the population.
Conclusion
Thus, such colonies will almost certainly be built and severe overcrowding on Earth relieved.
Evaluate
That there will be a growing economic incentive to construct such colonies to house some of the population does not imply that the incentive will be sufficient to make construction of such colonies actually happen.