Please stop incorrectly re-framing what I write into something you want to argue about.
There is a difference between a virus that has many different types of strains -- the influenza viruses -- so many that they have to guess at which ones will be the predominant strains and make a vaccine with those, and often guess wrong -- and this virus, which is well-defined. Of course this virus could mutate, as you well know. Nevertheless chances are that a vaccine will be at least partially protective against a mutated strain, depending on how the vaccine is designed. For instance, if this vaccine blocks receptors (or works by a different mechanism) that are the same in the mutated virus as it is in its current state, the vaccine will still work.
Also, current studies indicate that this virus does not mutate as quickly as the flu viruses do.

The attempts to say that this virus is "like" influenza are completely incorrect. Ask Dr. Fauci. This virus is far more transmissible, and the death rate is much higher. This virus can leave "glass-like" fragments in the lung and cause permanent lung damage. Comparisons to the flu are bogus.