I guess that depends on what you mean by "major investment". If Six Flags is on a new timeline where each region gets one major investment per year then I think we'll be waiting until 2030, but if they can improve the financial situation then we may see something around 2028 or 2029. Some of this will be dependent on 2027 pass sales. The company knows that guests are not satisfied with the current state of things and I bet John Reilly is going to do his best to keep the ship upright and sailing forward. I can see more parks being sold off sooner rather than later — I just hope we don't see another sale to EPR and/or Enchanted Parks. The amusement/theme park field needs some new competition.
This is a really nice thing to read after a period of a lot of folks being upset (and maybe antagonistic) with the park! There's still a good enough product at the base, it just needs some more thoughtful TLC (and money) to get it up to a more enjoyable state.