most people, like you, think that the free infrastructure around us is a fait accompli which doesn’t require us to personally get involved in their maintenance
I do contribute time and donate money to open source project so... miss?
With less contributors simply mean we will have to be smarter about which projects we supports. In open source it's a natural process. People support projects they actually use and need. If we can't get enough resources to support even the most basic infrastructure then the experiment will end.