After it cooled down enough I decided to add more starter - also known as more yogurt. Then I incubated it in a cooler and this morning I have a pretty good batch. Not as firm as I would have liked, but not milk either. It's not pretty but it's roughly as thick as say, Dannon. I like super thick yogurt, but I'm happy to have saved it the batch - that was a gallon of yogurt after all!
I didn't wipe the dish down, but I wasn't feeling terribly motivated.