Blu-ray speed

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I've seen how things like the dual layer are going to be 50GB worth of data, right? So, let's say I were to buy the first blu-ray drive on the market. How long would it take to burn 50GB of data onto the disc? How much RPM will these drives have? How many kbps or mbps will 1x be, and what will be the fastest speed? Why don't they just make a blu-ray drive that can fit like 3 discs in it at a time and use that like a hard drive? Since they'll be making multiple layers the storage on one disc could be nearly infinite! and just keep the discs like platters that can be removed and never fragmented? This just got me wondering... Are they going to make like BD-RAMs or BD-RWs? And what would the interface be for these drives? SATAII sounds like it would be best, since it's the fastest and will eventually become outdated. Because IDE has always been a pain since the connectors on the mobo and drive are so ridiculously big compared to SATA. Even though people are slowly trying to buy things to fill up their PCIE slots, i don't think it would be a good interface for a disk drive since there will be an annoying wire from the back of the computer to the front inside the case reducing airflow.
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Sorry, i think i've been ranting on and on. I'll stop now. Please answer above questions, someone.