Even if we have one, the larger problem will be scale. Having more than one type of effective vaccine available may actually be useful, since our existing manufacturing capacity for the different manufacturing processes can be used.
Vaccination on large scale will likely require tens of millions of doses, if not more (and let's not forget you may need more than one inoculation).
That wouldn’t even be enough to vaccinate a mid sized EU country.
The economic benefits to distributing a vaccine quickly would be huge, but I haven't heard world leaders talking about how to do it--they're still on the last war. Luckily, Bill Gates is spending on it, but this needs way more attention because this is our chance to be ahead of the virus for once.
https://www.weforum.org/agenda/2020/04/bill-gates-7-potentia...