I think so. I saw him this past year in the NY Penn League. Nice swing. Move to catcher will probably help him as a prospect-wise. BA actually answered my question in the latest chat:
Andy (Syracuse): Will a switch to catcher hurt or help Carson Kelly prospect status? If he hits, a top 100 prospect next year?
John Manuel: It was factored in for the book and when we did the Cardinals top 10 in the fall. It would clearly help. He’s very young and might have been a regular at 3b, but catcher makes sense for his lack of speed. Obviously playing catcher is harder than playing third base so we’ll see how he looks after trying to actually play it in games. I like Kelly, but the Cardinals made a nice heist of Randal Grichuk from the Angels in the Freese-Bourjos deal, and that pushed Kelly out of the Top 10.