the most noticable time that nearly everyone will remember would be at the introduction of helheim when the game reacted so badly they had to reduce the range of the watchtowers from 60k to 30k to reduce the workload on the serves,there are numerous other examples of overworked servers from the lag time/blue circles during certian global event,mostly jot and asgard,if plarium spent some of the millions they make into upgrading thier hardware and providing a smooth/bug free running game i would be more open to new content,however thier policy towards game playability appears to come a distant second over extracting as much money as possible from as many players as possible.
Some people will like and some will not like your suggestion,however regardless of that, consideration of how it will be implemented and affect the game must also be taken into account.