Sony & Panasonic to jointly develop next-generation optical discs, with recording capacity of at least 300GB

Where are my BDXL discs?
At 125Gig, I could already back up all my family videos on 5 or 6. A 25 pack would have been enough to make several copies.
But those have never materialized in the US.
So why should I believe that these 300Gig discs will ever show up here?

Source: http://www.zatznotfunny.com/2013-07/sony-panasonic-to-jointly-develop-next-generation-optical-discs-with-recording-capacity-of-at-least-300gb/

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