Panda still runs fine and is mature. It has support in terms of tech and bug support still. It is a solid foundation and has the flexibility to match any of those themes if you have a capable front-end developer to shape it as you wish. It doesn't really need to be updated, perhaps with a new preset layout/design to match the fancy new themes, but not necessary imo. Either way, from what I can gather, it's the best paid theme for TB right now.