There’s incalculable versions of corona virus. They are all different. Once immunity occurs against one version it is gone for forever. This corona virus is no different. Unless it successively mutates into different versions, repeatedly, it will not require a new anti-body to fight it and will be gone forever. The Spanish Flu had one significant mutation which was responsible for a second round of infection in 1919-1920. After immuntiy to that version was developed it was gone for forever.
Comparing COVID-19 to all conrona viruses is illogical. Like one model year car to all cars. There may be a COVID-20 but most likely not a COVID-21.
Here’s hoping you are correct - seems like some medical experts should be saying the same thing if they believe what you posit...hope to hear from them soon.