People without a professional background in test. Problem is everyone else thinks we have a conflict of interest.

A good enough test suite can mean you don't need manual testers. I have worked on such teams.

Those tests don't need to be done by TDD though!

TDD is primarily a design practice. That a test suite comes out of it is very nice, but not the main benefit.

Managers.

I miss my testers.

At my last two jobs we never had manual testing. Everything was automated.