If you compare this game to the previous one, you can see clear improvements. This dev isn't perfect, but in only two games they've shown that they can grow and deliver something better and more polished. I believe this opinion of mine will be reinforced when the next game comes out. They show a lot of care in their projects and they also listen to people's feedback. There's no need for a better studio to step in, they will become that "better studio" sooner or later.
Also, I don't believe the problems this game has are big enough to warrant such a radical solution. This series is already pretty good, compared to some of the games that make it to this site. Japanese RPG Maker games are a bit of a wildcard, you can get something great or something awful. I believe this series falls on the great side of things, even if it could be improved. Admittedly, my complains are mainly related to the gameplay. I for one have no issue with the artwork, except for the nipples in the first game.