I can see a huge issue with not allowing strollers (except as wheelchairs); it greatly diminishes the willingness of a family with kids wanting to then spend time in IOA, specifically one park ticket holders would be far less likely to upgrade to a 2-park ticket under that scenario. People are paranoid as it is and take off stroller wheels for a 3 minute ride plus wait time to try and keep their stroller from getting stolen, so they certainly won't want to leave their stroller in one park while they're over doing stuff in another park. Seems like something that could come back to bite them in terms of wanting the experience to push 2 park ticket upgrades in a key demographic. Of course, there are also days where I'm sure they won't mind the disincentive that will be (like peak seasons).