When I was a kid, the first PC game I played was Civilization 1 and it came with 4 floppy discs, so less then 10 MB. Some years later it seemed crazy to me that most games come on a CD-ROM disk and require 650 MB of space. Now I am playing games that ask for 100 GB and it seems fine to me.
It wouldn't surprise me if 10 years from now 300GB would be the norm