I'd be happy if they put a pause on adding more mini-lands in favor of focusing on improving the original areas of the park. Area 72, Adventure Port, and Camp Snoopy are nice but I hope we see an Old Coney, an Oktoberfest, and a Rivertown expansion/refurbishment before the park carves them up even more.
Some of my previous iterations for this area included a new flat ride in the Saltwater Circus plot, but I've been really set on a 2-level indoor restaurant or a small pond surrounded by a lot of nature (to make up for the lost Swan Lake). After some measuring, I've found that a 1 story building around 8,000+ square feet could fit there and could be larger depending on the footprint. It'd be half the size of the Grand Pavilion at Cedar Point (16,000+ square feet on the ground floor), but you'll be hard pressed to find a space for something of that size at Kings Island that could also fit into its surroundings. A flat ride might do well though.