Up until not too long ago having a complete system made with SSDs was not really a practical option for the most photographers. I mean the highest capacity SSD was 2TB and it was a hefty sum of $800, give or take a byte.
But now, Samsung is in the process of manufacturing a huge 256-gigabit SSD (32GB) should enable significantly more storage on each SSD drive. Considering that 80Gigs of data were around $70 just a few years back on 2004, I think that it will not take a lot of time until SSDs will replace HDDs completely. I mean, price per HDD storage dropped from $0.5/Gig to $0.0317/Gig in the course of the last ten years (that is a 96% drop) so it would not be surprising to see these huge SSDs drop from $400/TB to $25/TB in a similar time frame or to $130/TB in the next two years.
Engaget reports that Samsung are upping their yield and planning to ship during 2015. This means that even this year we will see bigger SSD drives at cheaper prices.