I think Wong is the most likely to be the odd man out. I want him, but he's nothing special - he seems very likely to meet his ceiling, but his ceiling isn't super high. He isn't a wizard with the glove, he has very limited power, but is just a consistent contact hitter. They have more talent at those two positions currently.
I know their plan may have been for Carpenter to be their rich man's Jeff Keppinger or whatever you want to call it when the season began, but he has been one of the best rated defenders at 2B in baseball this season and I'm not sure if they're eager to shake up such a nice infield for s***s and giggles. If I were the Cards, I'd want to find a way to turn Wong into a shortstop via trade