I think GW2 showed that voiced town npc's are more annoying than anything else. And SWTOR voiced storyline, while enjoyable just isn't compatible with a MMO update schedule that players expect. Despite the fact that SWTOR was sold on being an "Endless RPG" and for promoting story, the painful year+long wait for any new addition to it's main storyline shows that it just doesn't work. Especially for a subscription based MMO.

I'd rather that XIV's approach to continuous story updates like they've done with version 1.xx and promise even more of for ARR than take months to a year for a voiced storyline update.