I just have a hard time thinking that if I'm 50 before my kids finally move out and the marriage was over way before that, I'll be 50 and trying to find a new partner. My wife and kids will be gone and I'll be able to spend the rest of my life... alone? That just doesn't sit well with me. I don't think it'd be wrong of me to divorce in order to find happiness with another partner, especially because it doesn't seriously screw children up.
Anyways, all of this is just talk. I don't need to worry about this because I'm far too picky and opinionated to end up with someone that I'm not compatible with... so when I end up married, it'll be to someone that is most likely going to be with me forever.