How many movies can be stored on a Blu-ray disc?

There are 16 layer single sided blu ray discs which have storage capacity of 512gb. That suggests at current abilities a 2 sided disc having capacity of over 1 terabyte.

The research and tools for more levels is ongoing. As such it is likely that this will expand a good deal more than that (there is no physical reason why we couldnt double this many more times)