Yes, but this is China that you're talking about where EVERYTHING is connected to a lying government. Nothing would happen except for a coverup as the Chinese government will never ever come clean.

In a sense, I don't really mind, because we're clearly not treating research into viruses (particularly gain of function) as the truly existential threat that it is. We should be, regardless of whether covid-19 was natural or a lab leak, and it's annoying that it might require a real lab leak at some point for us to take controlling such research seriously.

Would it? If such is possible, leak or no, more stringent controls should be implemented regardless.

In any case, you will get no such evidence, so society should proceed as if evidence is in hand, if such is even theoretically possible.