I spend a rather large amount of time earlier this year looking at just this for an assignment, so I'm reasonably up to speed on the idea of biometric chips. The only upside to an embedded RFID chip is that it's much harder to lose your card or leave it at home. The downsides are massive:

* RFID chips are a health risk - they've been known to cause cancers in rats since 1996, and there is evidence of increased cancer risks in large animals too, such as dogs and cats. That's a risk in itself. They also block you from having an MRI scan in the future.
* They are hard to lose, but very easy to clone. Once your chip has been cloned you need surgery to change the password!
* If the idea takes off, where you do put different RFID chips around your body so they don't clash, or does there need to be a global standard? Do employees need to have the chips removed when they leave the country
* You can't remove your staff pass. Ideally, you only wear your staff pass in the office, so people outside the office can't easily copy/clone it. Try taking the RFID chip off on a daily basis...
* Companies are already banned from forcing implants on their staff in some states - California and Georgia come to mind.

And this is all before employees turn around and tell employers to go screw themselves over being permanently tagged and scarred by their employer, who can now keep tabs on them after leaving emplyoment...