One of the reasons I first liked the Glock was because it didn't have an external safety. I had been a revolver guy and if something happened in the middle of the night I didn't want to have to think if it was up or down on the safety. It was just point and shoot. Then I learned that Glocks had 50% fewer parts than the current pistols, and that appealed to me. And then all the tests. Hokie smokes. They tried so hard to make it fail, and it just kept on shootin'. So I took a deep breath, and got one. The .40 S&W hadn't come out yet, so my choice was either a 9mm or a .45 ACP. To me that was a no brainer. Been carrying around a G21 ever since. Sometimes when I'm all dressed up and carrying someing small, it'll be a 2.5 or 3" S&W .357, but most of the time it's the Glock.
I have never heard any reports of pins working their way out, or any damage caused by polymer fatigue. If you look at all the gazillion copies out there, I think if there was a problem with the polymer frames, some manufacturer would have blown the whistle on it a long time ago. I have read of a few tests where they put over 100,000 round through a 9mm, and I think one was over 300,000. I know I'll never even come close to that, because I have so many other toys to play with that none of them will ever get worn out due to over use. I do believe your kids will enjoy your Glock long after you're gone.
