Disney has to bus guests all around their property, so I dont think its too big of a deal. It would keep guests on property (Hotel) by providing buses to and from the SeaWorld/Aqutica area. I personally think they need this with the hotels on property and new ones on the way (got to fill those rooms). Plus this would give Uni the ability to offer a 4-5 Universal Pass just like Disney. A few years back I would have agreed this is not a good idea, but I think it would be a great move, assuming the price was right. I personally am not a huge fan of Sea World, but I love Aquatica. And while this is just anecdotal, most of the friends I know love Sea World and always make it there when they go to Orlando. And just think of how different Antartica would be if it had been in the hands of Comcast
Imagine, if guests starting staying in the Uni part of town and only going to Disney for a couple of days. While that seems far fetched, if they put some money into Sea World and made it a must visit park, then which is more appealing for a five day trip:
Disney has an advantage because MK draws everyone in. But I could see a group of people starting to spend most of their time up north in Uni world, then only going to Disney 1-2 days. MK is a must do, but after that Unis line up would be very competitive and get a percentage of guests to at least consider staying up north vs down south. And that is what Comcast really wants.