The ComputerWorld article is titled "New MacBook Pros to hurt MacBook Air sales?"
The point put forth in the article was summed up in the end:
"If Apple adds built-in 3G/WiMAX to the Pro package or outfits it with an energy-saving SSD/Hard drive hybrid model, it might be the deal-breaker for a lot of would-be MacBook Air customers. That possibility might be reason at least to wait and see if you are shoppting for a new MacBook Air/Pro."
Considering that the Air was just released at MacWorld perhaps it is in Apple's best interest to delay the release of the MBP as long as possible given that the Air is the top selling Mac at the Apple Store.
The price difference between the Air and the entry level Pro is only a few hundred dollars. ComputerWorld does make an interesting point especially if the Pro adds any new features.
Still, I do not think WiMAX is a reason for switching to an MBP instead of an MBA. What concerns 3G- as far as I know, the 3G coverage in the US is quite limited (which was also a reason for not giving the iPhone 3G but EDGE connectivity). They both have bluetooth so you could use your mobile phone as a modem.
Isn't there a possibility that Apple is going to implement 3G connectivity together with the iPhone 2 (which has been said to receive 3G in 2008)?