At a high level the idea makes sense - build the kind of ride that can be opened as an up-charge for night markets that doesn't give away the gate and de-value the park's day ticket proposition. The problem is when you scratch deeper, there's a litany of reasons that should tell you why it shouldn't be a thing.
For example, every park planner or designer will tell you why it's bad to concentrate so much stuff into the first few metres of a park. The obvious one is that it hinders crowd flow management in a significant way - on a busy day, Dreamworld will have two rides, a show-stage and a critical photo point within centimetres of each other. Think about this then - people typically move to the first thing they see when they're in a park - as a result, will a guest's first experience of the day be stuck in a line that's overflowing because due care wasn't given to filtering people out first? The second reason is that there's a well-established tipping point between time in park and per capita spend. By extension, if you're concentrating your experience into a few square metres, people don't journey as far through different lands, they don't stop to buy F&B, they're not being immersed in different themed environments (marginal affinity relationship) and so on and they're less inclined to spend more time in retail etc. etc.
Thirdly - there's a reason why Disney (yes, Disney) don't have a kiddie ride right when you walk in, they have a train that gets people out of that space - it's out of place thematically. Those that say "well Sky Voyager this" or "it's a different park" are negating the fundamental reality that the park doesn't look the way it did precisely because of a continued culture (or rather, ignorance of culture and heritage) to preserve and plus what they have. Instead, we've got make revenue-first strategic choices that place all else second.
Finally, it removes a strategic point to place shows and events. If you're worried about kinetic energy, put in a better fountain display. 🤷🏻♂️