Questor,
Not sure it's the calibers that made the difference. It may be more hunters are now trying handgun hunting than ever before. I am convinced it is more fun than rifle hunting and the thrill of working in closer to the game is more exciting than a distance shot (at least for me).
Of course they could mean that it's just as easy to miss with a handgun (due to lack of practice) as it is to miss with a rifle (also due to lack of practice). And it's easier to carry than a heavy ol' rifle for those that only go out once or twice a year.
I look forward this year to success with my 12 inch 44 mag Encore. No bears where we are so no issues with multiple shots vs. single shot. Can always reload in about 2 seconds. With the scope, I can reach out 50-75 yards for many of the shots I would have with a rifle.
Put it all together, it's about the challenge, the convenience, the fun, being in the woods and eventually, the success of of taking game with a handgun. If I had a choice of having a rifle and a handgun with me to make the shot and I could make it with a handgun, I would always choose it first.
Mike