Mom will probably continue to drink and stay out all night bringing random dudes home to the house. Kids will start to complain about the back and forth between two houses. Statistically your children will be more likely to divorce in the future.
What you described above was my parent’s marriage and I had nothing but great childhood memories.
Again I’m not telling you not to divorce. I’m telling you to divorce when you are ready and want to divorce.
Lastly you are painting yourself as the prince in your scenarios when we both know it takes two people to create an unhappy marriage.