Indeed. And let's add to that list of diseases those that have been eradicated or (nearly so) the following:
Measles
Bacterial influenza
Mumps
Rubella
Tetanus
Diptheria
Chjcken Pox
In addition, there is now an effective treatment being used to minimize the symptoms of influenza (called Tamiflu).
Also, AIDS was a death sentence 20 years ago. Not anymore, thanks to the development of medicines that now allow sufferers to live long, normal lives.
There are no guarantees that a vaccine or an effective treatment will eventually be found for Covid-19. However, it is way too early to draw the conclusion that none will be found. The last thing we should want is to be telling the medical researchers, the labs, that the situation is entirely hopeless and it would be much better if they packed up and abandoned their search.