64 through 256 GB mask rom cards the size of SD cards would be awesome. Even 64 GB would still be more than BD and it's old enough vs 128 and 256 that it's essentially thow away cost wise. 64 GB flash retail is what $20, mask ROM wouldn't even be 1/4 of that. Most of the "cost" of flash memory is profit and the convenience and novelty of reuseable high capacity storage to the consumer; NAND is literally the easiest thing to make in terms of silicon production, and mask ROM is way cheaper still.
Mechanical media and its 15 day access time just needs to go away. This isn't 1950 anymore. Seriously who the #$%! uses magnetic tracks or 1979s music discs to read computer data anymore?
I'm just praying the next home media format for 4k is also something like a SD card. Vita sized cards and cases for 4k home video would be amazing.
I consider hard drives filthy and dinosaur technology, let alone optical. It's 2015 people, we don't use magnetic tracks to process computer data anymore.
PS the last desktop PC I built had 4 x toggle Nand tier 1 SSD drives in RAID 0 and my home LAN was 10 gigabit Infiniband. I don't measure I/O in kilobytes or even megabytes per second anymore.