Souplantation (also known as Sweet Tomato) was a soup and salad buffet in Southern California and other regions that several of my friends and I enjoyed going to. It unfortunately went out of business like many buffets during the pandemic. I'm sceptical some of the chains listed here such as TGI Fridays, Cheesecake Factory, or Jack in the Box really are endangered however.
Basically all of them are going through some post-pandemic contraction. But 75% of them will still be around in ten years, and those that aren't (Ruby Tuesday's, Ponderosa) were heading in that direction anyway.