Looking at what this years lineup is so far, I don't think it's going to be celebrated with a wimper. It's got the goods.
As for a two park event, that was definitely quite the feat back in 2004. Though for current times, I honestly don't think it's worth it. The vast majority of usable space is in the studios, IoA can only offer a house or two at this point. (Carnage Warehouse and maybe Poseidon's Fury.) An the narrow streets just won't cut it for the current crowds. Not to mention the studios now have the tents and parade warehouse houses, you definitely don't wanna' leave those out of the mix, and the thought of having to walk from MIB to IoA or vis versa is not good.