I think we're pretty close to the mainstream switching now.
Inexpensive, large external HDDs will fill the gap on media storage for consumers long after the main drive has been switched to SSD for speed.
Consumers aren't going to wait for SSD to catch up to 5tb HDD externals that you'll be able to get for $129. They'll simply buy a system with 512gb to 1tb of SSD storage, and pick up the external if they need it.
Inexpensive, large external HDDs will fill the gap on media storage for consumers long after the main drive has been switched to SSD for speed.
Consumers aren't going to wait for SSD to catch up to 5tb HDD externals that you'll be able to get for $129. They'll simply buy a system with 512gb to 1tb of SSD storage, and pick up the external if they need it.