Would a druid planning on becoming a planar shepherd be smited instantly for their intention, or would the gods wait and see what plane they attune to? It's just a druid with a cute gimmick if they're not taking a plane with an altered flow of time (e.g. D

Most likely the gods would wait and watch to see if the Druid steps close to the line. It’s a dangerous game, though, because that Druid can get out of hand really fast, to the point where the gods might not be able to stop her anymore. Even the evil gods don’t want to see that kind of thing. Mostly. You never know with some of the more tentacle-y ones, though.