As I understood the originally planned system, more wards would be automatically added as needed. That would have been a great system. As it is though, wards are being added way too slowly, not "as they're needed" at all.
Also, they aren't addressing issues of over population and under populations by adding more wards where more are needed compared to the less busy cities that don't need as much. On many worlds, Limsa is by far the most popular ward and people will be complaining a day after these new wards are open that yet again there are no free spots in the most popular area while the new wards in the other cities will probably be mostly empty.
I think Limsa needs at least 2 new wards on every server and again as regularly as needed. Not saying don't give Grid and Uldah some love too but if one is more needed than the others give it more so it can meet the demands placed upon it.