There has actually been on/off rumors over the past 10 years or so that they would dock the Liberty Belle Riverboat and turn it into a restaurant, although Tiana’s Place was a stand alone building if I remember correctly.
This rumor has popped many times when using Tom Sawyer’s Island for park expansion/a new land by docking the boat permanently and adding a bridge to get to TSI has come up in proposals at WDI. Those never seem to get too far, but I do imagine one day that may eventually happen as MK doesn’t have an abundance of expansion land. There’s definitely a few more obvious plots (Backstage parking lot near Buzz exit could has a large ride) and then maybe one or two more if they get creative, but TSI might be the way we see them go before they have to get creative because of how much room they would have to play with.