My money is on NO effective vaccine for covid-19. Even the common flu mutates so much, the vaccine early in the flu season is just a gamble. So you are right on mark about mutation.
Why after all these years there is no vaccine for common cold which indeed belongs to the corona family of viruses.
If I were to get sick with covid-19, I would ask my doctor to administer HCQ+Zinc+AB ASAP before I end up needing a ventilator to breathe.
I am a big believer in keeping natural resistance high with good nutrition, exercise and plenty of sleep.
Actually, most ‘common colds’ appear to be rhinoviruses. But there are numerous strains of those out there, too.
Interesting article on ‘Why Haven’t We Cured the Common Cold Yet?’:
https://www.scientificamerican.com/article/why-havent-we-cured-the-common-cold-yet/