I've done three floorless conversion B&M stand-ups now (is that all of them?) and none of them are super comfortable rides but, at least in the case of Firebird (the only one I've done before and after), it is still an enormous improvement. Definitely not saying that a relocated, floorless Green Lantern would be a flagship coaster, but there are parks in the chain where it would still probably be one of the stronger attractions in said park. Think about, say, SFStL. Swapping the likes of Ninja out for a converted Green Lantern would be a monumental upgrade to the park's lineup.