But, what about all those people in the future who chose not to have families now?
They can look after people they're not related to. There are so many people in the world that need some care and/or attention, I can't foresee the future, but I'm extremely confident there will always people that can use your help.
There will always be people who require/ want help, but in a society that has largely been built to help itself, I am not sure that people would pivot. Instead, it would likely be more that people double-down, and help themselves more, thinking if they just get enough for themselves, they will be contented.