N64 would have had more games.... and cheaper prices on them.
Sometimes storage space might even have held back certain things (textures, sounds tracks ect), and haveing CDs could have resulted in better looking/sounding games. All this together, could probably mean the hardware sales would have been slightly higher too.
Number of days to reach 50M from 40M : 198 days
Number of days to reach 60M from 50M : 187 days
Number of days to reach 70M from 60M : 175 days
Number of days to reach 80M from 70M : 227 days
Necro-bump this 2020: http://gamrconnect.vgchartz.com/thread.php?id=229249