I have noticed that there is a very apparent effect when one server dominates the map to the point where the point tally is at a state that they will remain #1 for the rest of the match.
This effectively kills the motivation to actually WvWvW as there is nothing you can do to turn the situation around – and the competition becomes dead for the rest of the time. If the situation is like this for 1 week matchups, imagine how it will be like once the duration gets extended.
My suggestion
Once the point tally reaches the state where there is a clear winning server – reset the map and grant the winning team a karma, exp or gathering buff.
This will reward the winning team for their efforts, as well as revitalize the match for the rest of the time.