It certainly sounds logical but we see no evidence of this. Software creation is the highest it's ever been and accelerating. Salaries are going up. Open Source is arguably one of the reasons we're where we're at. I'd argue anything that puts up a barrier or changes the incentives to open source might be the thing that killed the goose that laid the golden egg.

I don't currently get paid for all the open source work I do nor do I expect to be but if that expectation changed, if everyone expected to be compensated for their what at least starts out as their hobby, I'd guess the amount of people doing it drop drastically.

Of course it sucks if your project gets popular and you feel obligated to keep spending time on it but you can always walk away.

Otherwise my compensation is the feeling I get from helping. This is no different then volunteering. I don't go to the soup kitchen and demand a salary for helping out. I also feel compensated from everyone else's contributions. That companies like Apple (clang, llvm, swift, webkit), Google (android, chrome, angular, dart, flutter), Facebook (react, graphql), Microsoft (.net, vs code), etc...

They are paying me back by offering all of that. I'm sure you can name some rich company not contributing but I guess I really don't care.