I would say 2015. Two years ago, the price per GB was pretty much $2/GB (e.g. Crucial m4 MSRPs were $500 for 256GB and $1000 for 512GB). Now we are at ~$200 for 256GB and ~$400 for 512GB. Assuming the same pace in price drops, the prices should drop another 60% in two years, which would make 1TB around $200 by the end of 2015.
As SDD capacities increase, I would like to see commensurate warranty increases as well. After all, larger sizes, means longer overall lifetime for the NAND bank(s). Assuming that the SSD doesn't brick, which seems to be the most likely reason for an SSD dying these days.
Consumer electronics rarely carry warranty of over 5 years. 3 years is very typical and that's what most hard drives have too, despite their much larger capacity.
Worse yet normal hard drive capacities will be much bigger and still cost around $100 or half the price. Your media files in 3-5 years will take up more space.
They need to literally butcher the price, and do it quickly, for people to bite outside of the enthusiast community.
I think we are seeing a change in media consumption behavior too. Hoarding media is no longer necessary with streaming services such as Netflix and Spotify being available, so people no longer need terabytes of storage. Now, I don't think those services are anywhere close to perfect (yet) but they definitely eliminate the need for tons of storage for many consumers.
Look at tablets and smartphones for instance. The majority only have 8-16GB (tablets maybe 32GB) of storage even though 64GB has been available for years and 128GB is now available too. Hence people have to rely on streaming services because even 64GB isn't a lot when it comes to media, but with streaming all the content is available on any device. We are more and more moving towards a model where people consume media on multiple devices and streaming works much better with that model since syncing won't be necessary and there are no space constraints. I know bandwidth/data caps present some issues but the issues persist with downloading as well (and physical media isn't getting any more popular).
I can definitely see 512GB, even 256GB, being enough for most consumers. After all, a 16GB iPad is enough for them.