Just FYI....pretty sure that is not a 50 gallon container. This is the rubbermade 50 gallon container:
I would bet it's more like 10-12 gallon. My 25 gallon pots are taller and as wide as the longer side all the way around. It should be okay in that pot, but won't probably have super-vigorous growth. To answer your question, though, if it gets cold, yes, you can bring it inside and it should be okay. If it does bloom, theoretically bunch size should already be determined, but development of the fruit might be difficult since it was recently transplanted and lost much of its root system.