I can see some internal flash memory inside the PS4 or the next xbox. Probably 32GB, maybe 64GB. Today you can have 8GB of NAND flash (MLC the one used for in SSD) for roughly $6.10 at contract prices. In the case of 32GB, you would spend 24.40$ on your BOM on flash chips, adding the controller costs (maybe $5-$10 more?). Overall between $30-$35.
18-24 months double the capacity for the same price.
18-24 months double the capacity for the same price.