The original question was a little ambiguous... do they mean "phone" as in a dedicated chunk of hardware for talking on or do they mean "phone" as in some way to interface with POTS? We are phasing out our POTS phones, but we still have a do-dad hooked up to our computers. Many of us also have company-issued cell phones. The computer do-dad (hooked into Office Communicator) is mostly for making international calls, since no cell carrier sells competitive international service. I personally still have a desk phone for international calls, since they haven't switched me over yet.
That's just it.
What do you do if you GET a phone call? Does it play on your computer speakers for all to hear the results of your "test" at the Dr's office? Headphones? Bluetooth in your ear all day? Is it going through your smartphone? What if the battery is almost dead and you've forgotten your charger? What if it falls out of your pocket into the toilet? What if it forcecloses the phone app because you installed a buggy copy of fruit ninja 12? What if your battery only lasts an hour because of a rogue weather app that won't stay closed?
I think people still need something permanent for POTS calls if it's an office environment, but it's going to get way cheaper and simpler.
Maybe a POTS style receiver attached to the PC via USB or actually into the sound card mic-in and phones-out and the pc app has a speakerphone function.
But it's still something LIKE a traditional phone.