Back when FFXIV was first announced, SE claimed guildleves to be one of the main features of the game. The claimed that guildleves would be a type of quest that could be done in groups or solo for rewards and experience and claimed they would be more fleshed out and involving than traditional MMO quests, stating that the average levequest would take between 30 minutes to an hour. I was excited, i envisioned guildleves as heavily story based quests much like segments of classic final fantasy storylines, complete with cutscenes, twists, and bossfights.
Then gamescom 2009 came along and a I pretty much lost hope in that idea. The quest they showed was pretty much "kill x of this mob". I thought that they were maybe displaying a very simplified version for demonstration purposes. Then alpha came and i soon learned that the "30 minute" length tanaka was talking about was a limit, and that guildleves could be completed in under 2 minutes.
So what we're left with as a main feature of the game are a handful of lackluster, stripped down MMO kill quests with petty rewards and a limit on how many you can undertake.
I think that SE has 2 options
1 - Make guildleves MUCH more exciting, scrap all the old ones and replace them with something entertaining and meaningful enough to be worthy of being a main design feature.
2 - Take guildleves out of the spotlight, develop enough meaningful content so that guildleves can be considered a little extra something to do when you're short on time.
I prefer option 2, Guildleves already seem like filler content, even though they are the main part of the game at this point. I think, guildleves should, lore-wise, be turned into something like work. Take away the SP gain buffs from guildleves and buff the item/gil rewards. Make new content to replace guildleves as the main method of leveling your character.