I understand your idea of temporary content. It gives player a feeling to be unique through the rewards and also keeps them in the game. Furthermore to keep all the content forever would create a overfilled world.
I remeber some unique stuff in GW1, there were only 4 things so far i know. Minipets (but if i remember right, beside the frogs all have a chance to drop out of the 6th present), costume heads (festival rewards, but also they are not unique anymore), some prepurchase items with no compareable but not too good stats and unique skins and old colours (the colour-system was overworked and a lot of great colours coudn’t be created afterwards anymore, but on existing armors, the colours wasnt removed), to sum it up, these things were more or less only skins.
Flame and frost includes a highly interesting story with enjoyable content and the time you could play them was really low. There are all kinds of players, especially the type, that plays nearly never but much, if (like 2 month each year, but then like crazy) will not see much of these living story things.
Please reduce the limitation to titles and include the content in some way forever. You could wait one year or so and then alter the content to make it constant content . You could create a area (like the hall of monuments), where you can play the storyquests again (without titlerewards), the dungeon could be a dungeon with a slightly altered story to fit into the world even after the living world event did end.
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