Not sure which side displays childish behaviour.
Sometimes, I feel like all the opponents to the higher megapixel cameras, are people that have spent years of savings on 5D body and two or three lenses, and are terrified that they precious investment will become outdated/obsolete just like that, especially if new gen lenses will be needed to keep up with resolution.
Let's hope Canon will follow sound business instincts, and contribute or lead in creative development, instead listening to unreasonable childish fears of current camera owners.
The whole new, let's say "very bold" pricing thing from Canon is another story, and is potentially causing the same effect, making even professionals to think twice about some radical new upgrades.