My only child just started full day Kinder last week. I was lucky enough to find a part time job, for 4 hours a day, during her school hours, so I can still be involved & earn enough money to pay our housing costs. It's a win, win, for me. My DH has M-W off, so he can pick up the childcare slack when there is a break, and I am going to be asking friends/family to help out with the other days.
I think keeping the daycare open after your kids are all in school isn't beneficial to you, your kids, or your bank account, personally. You can have your home back, your free time back, get a part time job & still earn a decent paycheck. All without the stress & headache of being responsible for & tied down to other people's kids for almost your whole day. When you break it down, daycare providers don't get paid what they're worth, at all.
I, personally, couldn't stay home all day without a kid at home. It just seems like a waste & I'd feel too guilty because I know I could be earning money for the family.