Has Glick announced that he is leaving? It was announced that Nick Robinson will be joining the cast when Ed Harris takes over, but he is playing Jem (Will Pullen's part), not Dill.
I think it's a reasonable guess that Glick might be taking over if Little Shop gets extended. But who knows? In any event, the cast in general seems fairly expensive for a small theater and a short-ish commercial run. Groff, Glick, Blanchard, and Borle are probably not getting scale.