Meh, the TCG was marketed as another way into the fad of Pokemon back in the day. Granted the card game was actually really good, but once the fad died down they couldn't bank on Pokemon's popularity to keep them up. Hell I used to see Pokemon cards everywhere. Nowadays they're not as present. It's definitely possible for them to make a new game and I'd definitely play it, but whether it would sell is different. Although I can't see how it would sell worse than those shitty Pokemon Ranger or Mystery Dungeon games they keep crapping out.
Hopefully, provided space limits aren't too much on "3DSWare" and what not, they'll start released downloadable games for the TCG, or at least update the original.