Yes, we can have multiple package maintainers. For example, we have about 6 people that manage sympy.physics.mechanics and have a group in the github org for them. But they mostly play and informal role, reviewing occasionally, submit some PRs, etc. Because it is informal, things slip past the radar, pr's linger for years, issue's aren't closed, etc. I'm fine with toning down the responsibilities, but the whole point, in my mind, was to make some responsibilities more formal. I see this as both an empowerment to the maintainers and spreading the formal load of managing this project to more parties. I'd personally like to see one main point person for each package, but there can be a group of people maintaining the package. The point person would simply take on the role of monitoring for things that slip past the informal group of maintainers and be the first point of contact for anyone who doesn't know who to ask questions about the code. We can have another column that lists the package "group" or something.
Also note that we could have per module maintainers to if that module is large or we can group packages together. I don't really know the size and complexity of the packages, feel free to modify the table to fix that.