when marty chose to quit her job and stay home with the kids it was, like for many in that position, a most hard decision to make. would you be fulfilled? could you handle the isolation? could you shoulder giving your life so completely to your children (people who will most likely not recognize or acknowledge your sacrifice for about thirty years)? could you manage to maintain your own identity when so much of you is given to others AND come out on the other side when those children needed you less and your work was, largely, done.
marty had all of these fears and many more but her instinct told her it was the right choice. and all of those things came: isolation (from adults), desperation (will it ever end), and deprivation (of personal wants). but marty worked month after month, year after year to see that she made the most of the time she had with her children by essentially, gulping the blue pill and putting her life on hold, to give her kids a stability and variety that their development needs and desires.
while it was crazy hard, i reckon it will be a choice and a period of her life she will forever be thankful and proud she did. and i imagine our kids will have warm memories of the rich and consistent experiences, like above, marty's blue-pill attitude afforded them when young.