| Gehirnkrampf said: one first prediction after 19 votes (seems way too optimistic for me, for now):
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Another thing you could consider is the sales of memory cards. People who bought 8-16 could be going all digitial to combination and 16-32 has a more likelyhood of going all digital. Too bad we don't have sales data on those.
Another thing to thing about is that, if true, digital versions on the Vita store are about $5 cheaper when compared to physical copies. It wouldn't be beyond the realm of posibility that a good number of vita owners are taking advantage of this.
Lastly, not all NA versions are sold in NA. Some copies find their way all the way here in Asia, not to mention there are a bunch of people, like me, who live in Asia but have NA/US PSN accounts for buying digital versions of games.
Edit: You might also like to separate by region. The distribution of retail vs digital in NA/US may be different in EU as well as in Japan/Asia since different environment, culture, perception, internet capabilities etc can affect the percentage of retail sales and digital sales.
