I always wondered why, when they are building new rides, they didn't go ahead and make them two stories and leave the bottom floor dedicated to HHN houses. I know that means some logistical issues within the building themselves, and the structure of some rides definitely wouldn't allow for it. It adds cost as well. But, when they are building rides, if they just added another floor of undedicated space, they wouldn't have to reroute anything for HHN and wouldn't have to worry about putting up tents or tying up soundstages. I'd think it would mean that they could do a higher quality build on houses too as they knew they didn't really have to tear it down year to year.
Just a thought. I'm sure there are reasons not to do it, but it always seemed like a good idea to me.