TBH , wet markets in China are not the big problem.
All over Asia, (and probably other parts of the world) there are 'wet markets' wilder than those found in Wuhan. I always make it a point to take a visit when I'm on holiday (holding my breath at times). There may not be exotic wildlife but there is almost always a variety of live animals being sold and slaughtered, alongside fresh produce and butchered meat.
These are not 'wet markets'. They are often the only markets that these people have. Unlike Wuhan (which had much less of an excuse, being a very wealthy city), there is little likelihood of these going away because:
(1) these places are too poor to afford hygienic storage facilities or refrigeration. If the vendors slaughtered the meat before bringing it to the market, it would be bad by the time it was sold
(2) there are no large industrialized pig farms, and no central slaughter facilities, and the local government is too poor to build one, or enforce public health laws.
(3) there is little education in rural areas, so the populace is not going to understand why the government is stopping their livelihood.
Hygiene and public health, unfortunately, is a luxury that comes with wealth and industrialization. Yes, it is indeed a time bomb waiting to explode.