Why not? The Arid pack was only for African animals (with some that just happened to cross into the Middle East).
Assuming we're right about the animals... People don't associate them with the climate/biome they live in so much as the region they're from. And when people think "temperate" its probably most likely to evoke images of woodland creatures from NA/Europe, and maybe even Asia. Pine trees, wolves, bears, weasels, deer, foxes, those sorts of animals. That's just what comes to mind first. Or even second. Or third. And it would feel incomplete to have a pack with that label that
didn't include at least some NA, Europe, and/or Asia representation.
So why go with that when there's at least two other more accurate names sitting right there that
do more closely link up with the species in the pack... That would leave that other name open for a potential pack in the future?
Could it happen? Sure. Anything can happen, I guess. But it would be a very strange look and wouldn't make sense from a marketing standpoint. It would probably confuse people when they read the species description and saw they were all just from one part of the world. Versus just calling it an "Islands" or "Oceania" pack which is pretty much what it is, anyway, regardless of what they call it.
And, TBH, the "Arid" pack 'worked' in that regard because when people think deserts... Most people think of camels. And each of the species are more linked with "deserts" than Africa (if that makes sense). But they didn't call it a desert pack so I think that was part of the problem too. LOL