Important topic and discussion

Sometimes me and CC run out of things to say to each other, but I still want to talk to her, so I try to facilitate a good discussion on a new topic. Like the other night when we were in the grocery store:

Me: CC, there is something that I want to ask you.
CC: What?
Me: Do you think that crabs would do a good job if they were in charge of running a grocery store, instead of people being in charge?
CC: Yes.
Me: How do you think it would be different?
CC: Everything would be really low to the ground.
Me: Yeah, all the food would have to be on the floor.
CC: Mmm.
Me: Wow, and I bet there would be a lot of sand around.
CC: Yeah.
Me: No, I bet the whole floor would be made of sand! And the food would have to be displayed on the sand, so that the crabs could move it around. There would be wet sand everywhere when you walked in. I wonder if they would not be able to display as much merchandise as they do now? Maybe they would use little hand trucks to move the food, but move them with their claws?
CC: YSA? I love to talk to you about this very important topic, but I am very tired right now. Could we talk about this later?
Me: Sure, CC!

But you know what? It has been two days and we have not returned to this topic. What is that about? Do you think she doesn't really think it's important?