Thinking out loud, I don't think I could enjoy a park with the majority of things to do being indoors. One of the key elements of going to parks is to get out, get some fresh air and enjoy yourself. Look at the studios, most everything indoors is a simulator and uses screens. While you can, in fact, do a lot of cool things indoors, you are still really limited. Who wants to build 100ft tall buildings from a financial and logistical standpoint? We complain about these big untheme boxes now lol, imagine a park full of them.