Among distribution rules to be discussed, one of the first points would be who is eligible. I would not want corporations to be supported by these donations, but some companies actually focus on FOSS as a service and I could see them getting in on it. I would exclude devs employed at a company getting paid to contribute as well.
I think this would not drastically change the status quo. Today, corporations contribute to FOSS, but mostly to make sure their hardware or other software is well supported. They will still have that incentive if there is a central donation system that excludes them.
You are indeed a good motivator! The reason I did not want to make this post at first is that I need everything: people to brainstorm with, people that can carry the project, people with the skills to create a prototype, people who can convince FOSS projects to get on board, and people willing to encourage others to donate.
Overall too much labor, skills and connection for one person. I believe we would need a team of 10-15 volunteers, some already involved in projects, to put something up