Because it's probably cheaper than Blu-Ray (failed formats should be at least) and it will probably be harder to pirate.

What is the read speed on an SD card?

@NJ5 if they use hddvd, they will be the only one, disks would cost more, since there is no volume to production, not a lot of factories set up for it.

Id say blue ray, or a combo if downlaod or multi dvds that you install to play. no more streaming from the disk

i think it is kinda funny that after 3 gens its becoming possible to go back to solid state carts and maybe just as cheap as disks...

it varies. There is a speed class system. The higher the class # the faster the card.

Example: 4 mb/s  class 4 card

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Feedback HP 4GB SDHC Class 4 Memory Card Our price: $44.99 Online Availability: In Stock: Usually ships next business day. Email this product to a friend Get it for less. GuaranteedTM Add to your wish list Add to your price watch Customer Rating : 5 Write your review No. of Ratings: 4 Rate this product In-store Availability   Pick up your order in store! Check Store Stock

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Hewlett Packard Class 4 (4MB/sec) SDHC card. Designed for SDHC compatible host devices. Record video and images, download music and store photos. Class 4 (4MB/sec) write performance ideal for the latest digital video cameras. SDHC cards are not compatible with standard SD host devices and card readers, and will only work on SDHC host

20 mb/s class 6 card

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Feedback Panasonic 4GB Secure Digital Memory Card Our price: $79.99 Discount: -$40.00 Sale Price: $39.99 Sale Ends: 8/7/2008 Online Availability: Out of Stock: Will ship when available Email this product to a friend Get it for less. GuaranteedTM Add to your wish list Add to your price watch Customer Rating : 4.5 Write your review No. of Ratings: 6 Rate this product In-store Availability   Pick up your order in store! Check Store Stock

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The SD Memory Card is at the heart of many Panasonic products. Panasonic's High Speed series SD cards can be trusted for both the highest durability and reliability in the market. The RPSDV04GU1A is highly resistant to heat, light, impact and dew condensation, so you can take it just about anywhere and use it in a wide range of conditions. More Info

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With its speed data transfer rate of 20MB/sec., this SD memory card provides a high-speed response for even large amounts of data. Incredibly small yet durable, the SD Memory Card is about the size of a postage stamp. It can store all kinds of digital content, like video, still images, music and more! So you can transfer data easily between products with an SD Card slot.

A 1X Blu-Ray drive has a read speed around 50% faster than the fastest SD card, so it's not really viable unless the read speed increases dramatically.

They are not going back to carts regardless what you want. It would seem Sony would have trouble keeping blu-ray away from MS due to MS being part of a consortium that came up with the protection. But it wouldn't surprise me if Sony tried to make life difficult due to MS making Sony's life difficult over the blue diodes.

I have a feeling the new XBox could make the current X360 look very insignificant in comparison. 2012 XBox would look good. Blu-Ray maybe? Could be a totally different media format that runs the HVD at an affordable price. 2012, new XBox with a $400 to $500 US price tag.

PS4 and new XBox with simultaneous world wide launches in 2012. Now that would be special.

Wikipedia says:
1x speed Blu-ray = 36 Mbit/s = 4.5 MB/s
150x speed SD = 22.5 MB/s

So unless you provide a source, I think that you are completely off base.

5 years ago no one would of expected DVD would of been surpassed with Blu-Ray.