So you think if the crowd level keeps on this rising trend they would expand it to both parks like they did years ago? I personally wasn't a fan of when they held it at both parks, I felt it left a lot of dead space with no scare zones or actors around in certain areas.
I'd have to peruse Screamscape archives for the exact year (maybe 2008? right before the recession kicked in hard), but at one point, the surveys suggested a two-park "mega" event. I think it's sort of inevitable, but then again, if they didn't pull the trigger this year when they should have seen issues coming, not sure when they will.
When just MSHI was open there was a lot of dead space, but I think that was because it was a last minute decision. With proper planning, could use a mix of SZs, food booths, carnival games, etc.
I feel like their response this year will be to open superhero island, and most likely make an 8th house there next year if no space opens itself up at the studios. The biggest problem with crowds is that people are just going house to house with no reason to stop. And for those who have gone to the shows, is it typically a full house or are the shows not bringing in that big of a crowd.
Next year, Transformers will still have that "new ride" smell and seems like a people-eater. Also, more alleys will be opened up again, and given the mixed reaction this year, I expect at least some traditional SZs to return. That should help with crowds.
Re: a 2-park planned event, if they go to the trouble of opening MSHI, I imagine they also open JP and at least parts of TL to let people walk through. The extra walking space alone would also help alleviate crowds. But again, if they didn't do this in 2012, 2013 should be less of an issue, so I don't expect this for a few years yet.
Along those lines, has anyone ever solidly confirmed Potter Land(s) are completely off limits during HHN? IIRC, the contract is online, no? The potential use of either changes the equation.
As for shows, I don't think I've seen B&T run with a full house yet this year (of course, once the park gets too packed to walk, I leave), but usually at least 60 - 70% full. Both times I saw 20 Penny it largely filled the smaller BJ venue, but there were open seats at the edges. Multiply times six shows a night, I think they are helping with capacity some.