Originally Posted by
Bazra
That's the thing. Blizzard have stated a few times that they do not want to give older players an advantage if they can avoid it, and vanity pets are a big part of the game for many players. They also contribute towards an achievement. I can't see Blizzard making any of them unobtainable - it just isn't fair. They will most likely move the pets to a new loot table, turn them into quest rewards or implement an Exotic Pets vendor.
All that having been said, it is still worth buying pets now, and enjoying 300-500% profit once the Cataclysmic inflation sets in. In fact, hoarding gold is the worst thing you can do pre-expansion, because your gold will decrease in value while non-liquid assets will increase in value.