5 years tops friend until we see a huge shift in the commercial sector. People with knowledge have been switching already in the last few years, and with Apple shifting their macbooks towards SSDs it's only a matter of time until everyone follows.
Maybe 10 years when we consider large data storage companies and units.
SSD
This is what it will take and this is what will take a decade.
Until the Netapp's, EMC's and HP's of the world start making data center scaled storage devices with SSD drives, then regular mechanical disk will always sell big...because they make an enormous amount of money on enterprise level storage solutions...
I have to work with vendors and when I last talk to them about this they were like "yeah we don't have any plans in the near or distant future to switch from a storage media that cost us pennies per terabyte of storage to a storage media that cost us dollars per terabyte of storage"
Now for applications that need and rely on disk performance...then SSD's are already starting to make their mark,,,but outside of that...gonna be a long time
The people with knowledge are not the people with the checkbooks...only when those people are convinced can SSD really start "owning" the storage market...and I think Samsung will be the defacto go to company for them...