I believe the parent is suggesting airlines buy their planes from a different manufacturer, not that consumers shop around based on manufacturer.
Ps if you're flying in a developed nation you probably can rely on regulators to regulate airlines, if you're flying in less developed nations, probably not so much.
> Or you know, get a government regulator to regulate airplane manufactures like normal countries.
You're assuming that the FAA does not regulate Boeing properly. Do you have any basis for this? The safety record of modern air travel is a huge success story for how public regulations and private innovation can work for the benefit of all.