Interesting. As I sip my morning coffee, i shall ponder what you wrote.Yep, you're thinking too much. Read up on how bats survive viruses.
Now consider the chain as a series of coin tosses.
The right bat had to have contact with the right bridge animal. Count that as mutation 1.
The bridge animal had to make it to market in good enough shape that it was passed through the market chain, and when it got to market it needed to be healthy enough somebody bought it. Lots of infected animals might never make it to that point, too lethal a virus and the animal dies before there is a chance for it to infect anyone. That's one of the comments on the Wuhan virus, that if it were more lethal it might have burned out by now.
The bridge animal that finally did get bought as exotic meat then had to have a version of the virus that could jump to a human host. Count that as mutation 2. That isn't enough though, the virus had to survive food prep -- for most meat the Chinese eat, that means at the least that it was very thoroughly cooked because the Chinese don't really like anything less than nuked from orbit levels of well done. All of that, and the human host then has to catch the virus.
Finally, the kicker is what we weren't sure about in the first days of the virus, was there human to human transmission? Count that as mutation 3. Once again, it isn't enough that there could be human to human transmission, there needs to be successful human to human transmission which means it got past things like people washing their hands and potential hosts' immune systems (although that may not be a major hurdle for a novel virus, it can still be a factor).
That's why I think the possible weakness of human hosts is significant.
It could make sense, the situation had to have the right timing/host to find it's way into the populous.