No I don't think so if he takes his work seriously. When you work over eight hours a day behind a computer and you are zooming, scrolling, panning, rendering, viewing and rotating in 3D mode, continuous lag gets real old. It could theoretically waste a portion of your day, staying at work eight hours, but only getting six hours of work done is very frustrating!! Time is money!! I just got a new card with an updated GPU and a gig of memory and I still have difficulty and I am not even dealing with solids. I did take my map I am building, which is over a hundred square miles to a guy that has a quatro 350 or 450 and he had no trouble what so ever. I believe those cards are $800 to $900!!
If he were just gaming I would have to say yes, it would be overkill, but if he is using it for work, rendering solids and 3D geometry, then no. In addition to that, the cost of the card is insignificant to what he will make on the project.