I personally don't like the idea of losing Medusa, but compared to the rest of the coaster collection, it makes sense! Medusa just isn't as popular as it was back in the early 2000s. With other B&Ms in the park that do different things, Medusa is just dull. I'm sure the general public doesn't even notice a difference between Green Lantern and Medusa except for the fact that one stands up! Also, if anyone remembers, Medusa's last year as "Medusa," the ride didn't open till noon because it wasn't drawing enough crowds. Medusa being transformed into Bizarro was its last leg at life. Because of Medusa's location, I'm sure if the park got rid of it, most guests wouldnt even notice that something is missing.
As for Superman, yes I would preffer to see that go. However, Superman draws crowds and is still popular amongst the general public.
Keep in mind, this is all just speculation.
-Dainan