Okay for that but would would that need sewage pipes?

Water yes (or at least most likely, they could use a dry system, but I doubt that), however as mentioned above, its the waste that could be the issue.  Still, my assumption is that there is some form of sanitary drainage back in those maintenance buildings.  One doesn't do maintenance type things and not get their hands dirty, which requires at least a sink.  However, to support a bathroom they may need a larger line, or the more likely problem is that they are at the extents of their sanitary line and expanding the system would require a lift system (ie pump) to bring the waste back up to grade so it can drain to gravity.

All told, if there is a true demand for restrooms and/or a larger water/waste service back there, solutions can be found that wouldn't cost all that much compared to the cost of a big coaster install.

I think we waaaaaay over think things like this. When the time is right for sewage, food and merchandise, it will happen. To justify the cost, I'm sure the infrastructure would be part of a gig..er big project.

Sent from my Pixel XL using Tapatalk

I've been told there is a restroom in the building where Chaos is held. So there's at least some water and sewage capabilities in the area. 

The cost of putting restrooms there, even if there wasn't already any infrastructure, pales in comparison to the price of a possible Giga, however. 

 With the direction everything is going in now, I would say that Kings Island by 2035 will be a bunch of chairs to sit in and look at your phone, coupled with a few areas where you can "ride" a roller coaster from the safety of a chair with a pair of VR goggles on. 

I kid I kid. 

That's far enough into the future that there are so many thing that could change rides as we know them. VR experiences while on rides so that you don't have the same experience on a coaster back to back? Man... the possibilities are pretty endless. 

By 2035 Kings Island will have that new park bench that everyone had been waiting for, this is how I visualize it...