I'm not saying that you're necessarily wrong, but what would be "a good proportion of women"? Given that probably 95% of all kids that are doing karting at a reasonably serious level seem to be boys then I think it's more reasonable to assume that a meritocratic system would generate something like one woman per series (obviously my figures are rough estimation, but you probably get the point). Which is not so far away from the current proportion. And that's assuming that physical strength has absolutely nothing to do with success in motorsport, which might not be a correct assumption. Also, the few women that are promoted aren't necessarily doing so well in their respective categories and there are at least a few examples of female drivers getting chances that they'd almost certainly not have gotten if they were male (Tatiana Calderon springs to mind).
I would say that the fact that what may well be 95% or more of those competing in karting being boys has absolutely nothing to do with any sort of meritocracy. The only thing you can learn from that is that vastly more boys try out at karting than girls within the current system and I think that is so much more down to societal norms and expectations than it is about talent.
Edit: On reading back through, only read the following grey paragraph if you are happy to read through my crazy ramblings. First and last paragraphs suffice mostly.
I would suppose that, in a perfect world, if everyone was and always has been able to get as far as their talent would carry them and nothing held them back (not money, not a lack of connections, not inherent sexism, not societal norms, not anything) then we would definitely seen have seen at least one woman reach the highest levels. I would add that, in this supposed world, motorsport has only just come to exist and society doesn't give a damn if you are a man or a woman. Now, we have had drivers like Janet Guthrie, Desire Wilson, Sarah Fisher, Katherine Legge, Danica Patrick to name few all having a go and doing fairly well and reaching, well, some of the the highest levels. So the initial supposition sounds sensible. I'm sure they all have inspired young women to have a go in their own ways. But this has been when there has been barriers (money, connections, inherent sexism, societal norms - the latter of which are thankfully less of an issue these days) which I think have slowed down any snowball effect on take up considerably from an initial position of being a male dominated sport which came to be in a male dominated society.
Anyway, to answer the actual question, I would say that for the sake of the argument that "a good proportion" would be anywhere between 25% and 75%, consistently, in every single category. Assuming that literally the only deciding factor on how far you got was how good you are at racing cars within a society that has never had any preconceptions on gender roles. We don't live in a perfect world though, so that's all just supposition.
Edited by Ben1445, 14 August 2019 - 17:01.