They can always make a vax using the traditional method, with a dead version of a recent strain.
This is what the Chinese are doing with their vaccines (SinoVax).
There is no reliable information to show that the traditional vaccine method is any more (or less) effective than the mRNA treatment.
I believe there has never been a successful vaccination treatment for any coronavirus and there are none at present. That family of viruses simply mutates too fast.
There are a large number of anti-viral and anti-inflammatory treatments which appear to be effective. That idea goes against the official narrative and has been systematically opposed by totalitarian-minded governments.
Our natural immune system response works pretty well too. Yet another idea that goes against the official (totalitarian) narrative.