Sure, but in larger capacities, even for professionals, they are extremely hard to find.
For example, the
LaCie 1 big Dock goes up to 16TB capacity, but the 1 big Dock SSD line maxes out at 4TB.
And of course the 4TB HDD is USD$499, while the 4TB SSD is $3489.
I'm not saying they should be equally priced, I understand an SSD's speed will command a premium.
But in terms of capacity, I'm not seeing much availability in the way of SSDs larger than 5TB.