I disagree. Blu-Ray drives will be much cheaper by the time PS4 rolls out, and that would give it the ability to have backwards compatability with PS3 and PS2 as well as the ability to watch DVD's, Blu-Ray, etc. Even with the (supposed) inevitability of digital distribution, by not including an optical drive you would be severing yourself from past technologies. That is not something any console maker will be interested in, as both Sony and Microsoft gain revenue off of things like movies, old xbox/ps2/ps3/360 games.
To eliminate it would just not be very smart business.
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