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It's absolutely worth it if you are primarily a mage (or alchemist). The Wizard Corgi has an aura that debuffs the Magic Def/Prot of nearby enemies over time. It's currently the only pet in the game that has a Magic Def/Prot debuff.
If you don't do magical damage, then your Ceraunus should be good enough, or you may want one of the other Corgi versions instead.
On the subject of a server merge, I think the only way they would do it is all four servers being merged. Otherwise they'd just be postponing a second merge between what is left sometime in the future. Imagine being the person who has to change their name multiple times, once for each time they do a merge.