Never said SARS and MERS were eradicated. They have been contained and limited. As for vaccines, there are many diseases where vaccines are not possible.
If COVID mutates readily, as some data seem to indicate, vaccine will have to be like flu vaccine, where you try to anticipate the strain for the coming year. Since flu vaccines are often only effective 30-40%, it may be similar with COVID.
My point was that it may be difficult to make a vaccine for COVID. Results are promising, but many vaccines can fall late. SARS and MERS still exist in the world. They're not eradicated.
Coronavirus Vaccine Tracker - The New York Times
A look at all the vaccines that have reached trials in humans.
Vaccines for SARS and MERS were never developed as, fortunately, the spread was contained and limited.
COVID-19 is a same family as SARS and it is referred to as SARS-Cov-2 to indicate it is the same family of virus with similar symptoms.
On another somber note, the death rate increase is now on the upswing.
Florida Sets Coronavirus Death Record, Hours After Gov. DeSantis Said State Had ‘Stabilized’
Almost all metrics continue to show the state’s crisis getting worse.