There are some very nice double wide strollers that wouldn't be an issue, but I think Disney's strollers (double wide or not) are just plain too bulky period.To be honest, I find Disney's own double-wide strollers to be way more bulky and annoying to be hit by in a crowd than a wagon or a double stroller that stacks the kids in front of each other instead of side by side. Disney's strollers also don't have compartments for bags, so you get people pushing them around with bags hanging all off the sides. If they're going to institute a strict policy about what strollers people are bringing in, they had better re-jig their own offerings to be less bulky / more storage friendly.
I'd rather see a ban on all double wide strollers than a ban on wagons.