How did television open up more job opportunities for actors & behind the scences work as well?

Answer 1

If you have a famous-face or name, of even was associated with a "name" TV-show etc. -- you can find work as a public speaker (which basically IS theater, when you think about it), or simply by showing-up and mingling at business events, golf outtings, entertainment/nightclubs, or actually PAID to be at a bar or event, so that a place's PR staff can say or show you "were there".