SeaWorld is an interesting one currently. I've been going to SWO/BGT since 2012 and personally I haven't noticed a difference in park landscaping/cleanliness. It's not Disney/Universal but it certainly continues to be strides better than Six Flags and somewhat better than Cedar Fair.
I do think the coaster trend is the right one for the park. They simply cannot compete effectively with the IP of Disney & Universal with immersive themed experiences. This is why Antarctica was not a success in drawing in the crowds. Without IP dark rides are difficult to market - and they spent an absolute fortune on it. There are persistent rumors of a new dark ride (maybe a flying theater) coming to replace Wild Arctic, likely in 2024, so we'll see if they can break the curse. This is not to say coasters can't be themed - they can, and I think Ice Breaker was a little too sparse so hopefully we'll at least see some better foliage and station for the 2023 coaster.
Coasters are visually appealing, easy to communicate for marketing, and give the park lots of kinetic energy. I would agree with the consensus that there needs to be more to do for lower height requirements. Getting Ice Breaker back to 48" would go a long way to this, and the addition of Infinity Falls helped with its 42" requirement. I would also be in favor of reopening Antarctica for this same reason. A Sea Rescue themed coaster in Key West with around a 42" requirement would be fantastic in the future.
It would be a mistake for SeaWorld to remove the animals (thankfully there are no signs of this happening) as it is a key differentiator between them and the competition, but realistically while the park might have the odd future success with non-coaster rides such as a Wild Arctic replacement in the future, it is unlikely to be able to sustain them. Coasters WILL sustain them as they are always crowd drawers.
Love it or hate it I think SeaWorld Orlando's future is much more a well presented Cedar Point & aquarium hybrid than it is Efteling or Universal/Disney. Might not be everyone's thing but it a far safer bet than trying to compete with Disney & Universal at their own game.