1. This vaccine race seems like "first one gets eternal glory" scenario, which might pressurise scientists to take shortcuts, which may be bad.
2. Even with successful vaccine trials, wouldn't take atleast an year to setup supply chain capable of distribution?
3. Virus mutates very fast, is it possible that all these early vaccine trials resulting in super virus which can't be killed by any kind of immune system.
2. No. Google around for this; there's plenty of info on how this can be done more quickly. Also, "even if we find a vaccine it will take a year or more to produce it at scale" is no reason not to develop one or to celebrate progress in such development.
3. Possible? Uh, sure, yeah, most things are possible. Probable? I'm not aware of any evidence suggesting that "early vaccine trials result in super virus" is a remotely probable scenario. If you are aware of any such evidence, please post it here because I'd like to read it and update my view accordingly.
My understanding is that at least some of the vaccines are being produced at scale while the trials are still ongoing, in the hopes that they will be successful and a huge supply will be needed.