I'd like to again suggest that an idea that has been bounced around could help some recent tamer woes.
(I'll preface this by saying that I for one am not a fan of the tamer slot introduction, for what that's worth. Neither am I a 'tamer' as I've no active tamer character at the moment.) There are not a few folks who are displeased with the perceived reduction of slots, and the introduction of slots via sovereigns/cash sales. Having a quick read of the forums here, or even genchat in game, makes that clear enough.
A possible remedy could be to give folks a general bump in the number of slots across the board, particularly given the introduction of all the new, fancy colors/types, and the newer purchasable mounts (windrunner, et al, particularly as these, the aforementioned are not ethereal and must be stabled). Then introduce a 'pet statue' option (which has been mentioned by myself and others previously). This could solve a number of issues. For collector type folks, they might be tickled to be able to display their prized pets in the comfort of their homes, on display pedestals, or lined up next to a cozy fireplace. 'Statued' animals could take no slot spaces (though a special tool to create them could be sold in the store for added revenue).
In this way, folks wouldn't feel the pinch of losing slots, or feel heavily pressured to buy additional slots. This, to me, seems to affect the game play itself, as opposed to being able to display pets as a type of deco, which feels entirely optional (akin to the pet branding tool). Animals are to a tamer, what armor and weapons are to a fighter class. Following this logic, we'll await armor and weapons slots.
*Tosses my two cents into the ever growing pool of pennies*
Cheers!
Conny