In my opinion, you should go on. Dive seems as great a skill in the beginning, as pointless and stupid it looks in the middle of the game, where it simply doesn't do much. Pushing towards skill like Lava call and Fiery Phantoms is much better, and the way to those skills (which require a certain dragon level) lies in Ball of Lightning, Mana Accelerator and Mystic Egg, as they are one of the best skills to pump up dragon XP AND be useful altogether.
In my opinion, even Mystic Egg is better than dive, because if you improve it well, you get a strong lvl 2-5 troop which alone can win your battles.
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