An accommodation or a penalty, either way, creating a separate section for passengers on an airline with children would be discrimination, let alone be incredibly difficult and likely require an entire new production of airlines. As someone who just got off a plane recently where a child was crying half of the two and a half hour flight, I still cannot see any reason to force parents with children to sit in another section. It could also create an awkward scenario for the airlines, much like the situation with weight as a reason to charge extra for flights.
In regards to potential discrimination, unless the airline makes it optional for parents to sit in a separate section, similar to first class, then it would be a major inequality issue. Likewise, it does not seem as if the airline would profit from adjusting seating and creating an additional section for parents on most flights. The only flights that it may make sense to consider the possibility is in extremely long transcontinental flights. Anything across the country is not long enough, nor is it a large enough plane to develop a separate section that would prevent any noise from children being heard.
Let’s assume the question is a matter of convenience and not meant to be a penalty to keep the noise away from others. The amount of redesign for a plane to incorporate a children’s section would require all new air planes where engineers would have to redesign everything. New Emergency exits would have to be developed and that would likely mean an increase in ticket prices. To the extent at which the section would be used (assuming this is an optional choice, not required due to the discrimination mentioned above) the return on investment may be too high of a risk.
On the average flight from one part of the country to another it is not feasible to add a separate section for passengers with children. However, it may prove to be a worthwhile investment for long flights across the Oceans, but before developing such a drastic change the company should research the possible outcomes.
The airline would want to know the costs to develop and initiate the changes, but also the potential retaliation it may create. It will also heavily depend on the attitudes of the public, so questioning them to determine attitudes of the changes, but also asking the potential parents and gathering data to determine if they would even use it if it was an option, is crucial. Once the information is collected the airline could move forward with a decision on whether or not long flights should have a separate section for passengers with children or not. Will it happen? Only the future will tell.