Even if I didn't watch demos, the world would still be just the same.
I'm not saying you would be running haywire across the entire world to clean out as many dynamic events as possible, but I really don't see no problem with running past 3-4 events on the way to a dungeon and taking them out with the group.
Obviously I'm talking about particular stages of the events here, killing a mob for Stage 49 on the way to the dungeon is fine, killing a mob for stage 49 then moving across the entire zone to kill another mob while clicking on sparklies in a second zone while touching your own bum is a entirely different story.