It will take a long time before SSDs catch up with the $/GB of a hard drive. That may not even happen at all. Hard drives did not catch up to the $/GB of tape. That doesn't mean tape drives are a better buy just because $/GB is cheaper. Tape just took on a different function: as a backup media.
I believe HDDs are well suited for media STORAGE and SSDs are best viewed as a PERFORMANCE upgrade. If you're buying an SSD for media storage at today's price, you're doing it wrong. I mean, do you need 250MB/s transfer speed for your pr0n? Buy an SSD for your OS and programs and be amazed by how responsive your computer will become.
Bottom line: It's a performance upgrade; not a storage device.