22% of 2018's had manuals.
Though I thoroughly enjoy driving a stick, even if still widely available I probably wouldn't buy one again. It's a novelty of the past, there are better technologies. Nor do I think the change will impact sales. I think the mid-engine will attract a lot of new customers that will offset any loss of existing customers due to not having a stick. Plus, my guess is that a lot of the Corvette stick fans will grumble, but ultimately the allure of the C8 will convince many stick lovers to buy it. And, if you want a stick in a true Corvette competitor, where do you go without spending $150,000+ on a European exotic?