Storm blood side quests I've actually really enjoyed, but I freaking LOVE your idea. A zone quest line would be so cool. I wouldn't get rid of the side quests we have now but just have less of them with the zone quest line being the bulk of the optional quest content in the area. Would make for some great new side characters to meet that you'd actually have an opinion on them after ur done unlike the mini 3 side quest chains we have now with forgettable characters.