For the clinician working with the person, the label might not make much of a difference. The addictive behavior still needs to be understood and treated within the context of the person's whole life. You have explained that there are no precise diagnostic criteria yet for Internet addiction. I think the signs of an internet addiction have been clearly outlined in the work of such people as Kimberly Young and Ivan Goldberg. I certainly will find people who fit this rather unusual collection of criteria.
MUCH research is needed to establish a diagnostic category as reliable and valid.
The concept of an internet addiction is new, so there hasn't been enough time yet to do this research. Until then, it's unlikely the DSM will be modified to include a category such as this. Set a realistic limit on the amount of time you are comfortable spending at the computer. Listen to the feedback of the significant people in your life. Ask yourself if your life is being enriched or depleted as a result of your time spent in the computer world.