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Costs and reliability - very good points. Regarding reliability, couldn't we say the same about BDXL technology? Certified discs for BDXL have a 50 to 100 years media longevity, or so it's said. Question is, how accurate are these numbers? The first rewritable 100GB BDXL discs hit the market in 2011. Would three years real world experience be sufficient to extrapolate the findings to the next 97 years?

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I wouldn't disagree completely – anyone predicting longevity greater than, say, 5-10 years is simply making up numbers and hoping you don't ask about methodology.

That said, BDXL has shipped in volume for years and has less new technology involved so I would be surprised if it's significantly different than older Blu-Ray or DVD/CD systems which have been heavily tested.

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