.40 Isn't For Everybody
I choose the .40 cause I can shoot it as well as any other caliber, its compact size, and it gives me the power I want. But I believe people need to choose the caliber they feel comfortable with and fits their needs.
Don't choose the .40 if it makes you a less effective shooter. The 9mm with good ammo is capable of anything you can reasonably expect from a defense handgun. (The Glock 26 is a good reason why the 9mm will live on) And people choose the .45 because they're not bothered by the bulk and having a big bore gives them a "warm fuzzy feeling".
Those who begrudge the .40 simply because its new or because they feel its a threat to the .45 are the only dinosaurs, not the rounds themselves. All the classic calibers have been updated with better bullet designs and more efficient loadings. The 9mm, .40, ,357, and the .45 will continue to fulfill the needs of every individual shooter.