True, its better to play it safe right now. They don't have a whole lot of wiggle room to make mistakes with people eating.
Jabbawankerz has proven that it eats crowds consistently... Adding a 2nd show is probably the way to go... I just don't know where they could house another show.
It would have to be something low-profile. We don't have globe anymore, so there's just Universal Plaza left.
They could set up a small stage and maybe have a cover band perform, or do a freaky magic show of some sort.
It can be something guests come and go as they like. Only way I could really see them adding another show.