The same trend occurs for designers:
http://www.indeed.com/jobtrends?q=web+design%2C+graphic+desi...
http://www.indeed.com/jobtrends?q=web+design%2C+graphic+desi...
But seriously, this is relative to other job postings, so you can't say it is necessarily a crash, it could just be that the diversity of job types is increasing, or other areas of the job market are growing faster than these particular ones.
No one wants a "Secretary" anymore, they want "Front-Office." "Office Assistant," and other buzz-worthy people.