No, not needed on a Linux OS workstation.
Because there is like only a couple of Linux virus in the wild. What's the point of wasting resources if your using Linux and scanning on-access for Windows virus.
Well, then why even have a Linux antivirus at all? Answer: Viruses and malware are coming to Linux. Not nearly as many, and their effects will tend to be much more limited, due to the superior security of Unix and Linux kernel architectures compared to their Windows peers. But they are coming.
Just like you can have malicious software in web pages and emails that can damage a Windows system, you can have malicious software that could -- at very least -- arrange to modify a user's files to create a trapdoor, or steal sensitive information from a password "vault," etc.
A 94% solution is not sufficient since 6% can create 95% of the damage. Again, we can reasonably expect that damage to unix-architecture systems, including Linux, will tend to be much more limited in extent and intent than windows-targeted malware. Still, there are plenty of good reasons to want an anti-malware tool for Unix systems.
And, yes, on-access protection for Unix and Linux are as imminent as for Windows for all the same reasons. For a comparison, see AVG free for Linux; they use the dazuko kernel module to implement their on-access scanner. (Unfortunately, though, AVG's does not have an alert mechanism, just a logfile. Someday, someone will get it all together.)