Yes, but a basic disc setup (as you describe) has no redundancy. Many low-cost redundant setups (like 'un-raid') are just above that, providing minimal protection.
I looked at it all, from small to very large systems, and found a system that provided enough drive slots that did two things: first, give one the ability to go with RAID6, and second, to provide goodly amounts of storage.
There are several systems in the 24+ drive range (so, 2TB drives, we're talking 44TB RAID6 array's), but are in the $10K+ range and have to be built to 100% from the get go.
I found one manufacturer,Thecus, where the number of drives (7), was highest, and it supported both RAID5/6. Therefore, one could build a 9TB RAID6 array for under $2K each, and simply stack them one upon another, building as your storage needs increased. And, the cost curve at the 'end point' equaled that of the 'superbig' boxes, 45TB at around $10K price point.
If one does the math, one can store some 360 BR discs (25GB ea) on each 9TB module, or at 35GB/ea, then 250. That works out to around $8/per BD disc (all depending on how large each disc is, of course). Pretty high compared to 'basic' discs, but it's RAID6 protected.
If one recodes it, though, the space can be reduced quite a bit (if BD25's, then almost half). I have one machine running doing that right now, and am bringing up another to more than double my output. But I have over 90TB of SD DVD's that I took some 7+ years to recode and burn, and figure that with HD, I'll duplicate that in about half the time. Once I get the production line going 100%.
So unless RAID array's and their drives drop even more (but I'll bet the burnable discs price curve will exceed that), burnable is the way to go in the long run. Not to say that some 90TB array wouldn't be nice, but at what price?
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