Well current blockchain size is already well above storage capacity of regular Blue Ray discs and it won't be long before it reaches beyond what even BDXL discs can hold. Also, you would still need to download the rest of the blockchain from where the data on the disc ends.

I honestly don't think this idea would work. People who are interested into running a full node already have enough disk space and high-speed Internet service so they don't need to get any other prerecorded Blockchain when they can download it themselves. Also this stuff will be very outdated by the time it gets to you and for collectors value one could just buy an external hdd and store the whole Blockchain on this instead of collecting a dozen blu rays every couple months and still the database will be outdated.

i don't think that the bitcoin blockchain can be in blu-ray, i mean, not the best method, unless it is an RW. you know, a very infrequent occurrence such as 51% attack will damage your recent block thus that disc may be led to out of order.

nowing blockstreams worse case scenario of 5mb blocks (using their segwit and confidential payment codes along with the eventual blocklimit of 2mb=5mb total potential bloat of data per block as of 2017)

each 25gb disk would only store 5000 bloated blocks as of 2017. which is the equivalent to about a month(34 days) costing $7(delivery included)
obviously each 50gb would hold 2 months, and the cost of $10(delivery included)
obviously each 100gb would hold 4 months, and the cost of $15(delivery included)

so the downsides
1. data coming from a single source so chance of abuse
2. risk of viruses included in disks (nefarious producer or intercepted/swapped during delivery)
3. $5+ monthly cost and probably still going to be a week+ out of date due to disk production time and delivery
4. requires people to buy a blue ray drive and endless disks each month

i think that instead of trying to make a business to get people who cannot afford good internet to shell out $5+ a month along with new blue ray drives. we should not be concentrating on the 7 billion people who as a whole dont have good internet. but instead we should concentrate on just the 1 billion that do have good internet.

inspire 1 billion people to be full nodes from their home with their good internet, is much easier to achieve than trying to convince people to buy a disk each month purely because they dont have good internet. because afterall those without good internet are not really going to to be internet savvi type of people. and it will just be like trying to sell prada shoes to a homeless person

I was under the impression that it's the indexing that takes forever these days. The download is the easy bit, albeit rather elongated.

yes bitcoin should reach everyone.. but trying to push 7 billion people is harder than 1 billion.

this topic is more about making people ful nodes rather than a different topic about making people want to spend bitcoin.
so sticking with the topic about full node adoption.. trying to get 1 billion is easier than 7 billion

i did it with ethereum blockchain.
People in my work saw me using an exchange and wanted to try it too, so i explained how it works, gave some ideas and sold a eth blockchain for some bitcoin   

Usb drives have made all other storage devices obsolete

better use a M-Disc for that.