Yes, but the reason the rides get replaced is the Universal values what's new and exciting over classic stuff. Not much has been replaced at Islands of Adventure because there is a lot of space and it's still pretty new, but the same lack of value still applies to Islands in poor maintenance, lack of publicity, and all that other stuff I talked about. Islands hasn't had much replaced, but it will because that's how Universal works and what they value.
I was pretty sure Nintendo land would replace what's left of Lost Continent and Suess Landing. Or Toon Lagoon. Though people here are saying ET and the kidszone. I havent researched it myself much. Point is, nothing at any Universal park is "safe" unless it is currently a hit like Spiderman or Potter and continues to be a hit.