Not quite true,
@Jason59707. The Gen 5 sprites were animated, we just got around it by using the first frame. The reason is that all trainer sprites, before Gen 6, fit into an 80x80 frame - but the Gen 6 Sugimori art looks awful if you try and stuff it into a frame that small. The problem is, every single card on the Trainer Card Maker is set up to accept an 80x80 sprite - we can't make it bigger without new cards. We'd have to have people create Gen 4/5-style trainer sprites for everything in Gen 6, something that just hasn't happened yet and is quite unlikely to.
The only other option is to modify the TCM cards to work with the larger Sugimori mugshots. So, let's say some kind soul donates loads of larger backgrounds for us which fit the new sprites at a reasonable size. Here's the next problem: you've suddenly got every single asset on the card being pixel-based,
except the trainer sprite, which honestly looks awful. The models on the current cards are borderline anyway.
The Pokémon and badges are fairly easy to fix on my side, I can create new stuff to match the 3D model/Sugimori style, no worries. But we'd then have only a couple of assets for this "new" format - maybe a few backgrounds if we're lucky (or I make them..), and the Pokémon and badges should be fine, but the trainer sprites would suddenly be severely limited because we just couldn't use the old ones anymore - including the hundreds of custom sprites submitted since the TCM started years ago. We'd literally have to start from scratch, which just hasn't yet been worth it.
There's another issue, too: the skill level required to emulate Sugimori's style is far higher than it is to create the sprites we use right now. So our already tiny pool of contributors shrinks to near-zero. And that's the thing that really killed the idea in my mind - we could do it, I could spend hours slaving over the new art (and maybe a code addition to the TCM to choose between new-style and old-style cards), but would that ever be expended beyond the initial launch by the community? Could we ever get to the point where our library is back to the level of variety it is in now?
In a closely related note, there was a suggestion a while ago for customisable trainers, which would possibly help a bit with assets for trainers, at least - I wrote a pretty extensive post about it
in its suggestion thread.