Will this mean Keybase will be killed in the near future ?

From the blog

Initially, our single top priority is helping to make Zoom even more secure. There are no specific plans for the Keybase app yet. Ultimately Keybase's future is in Zoom's hands, and we'll see where that takes us. Of course, if anything changes about Keybase’s availability, our users will get plenty of notice.

So, our shortest-term directive is to significantly improve our security effectiveness, by working on a product that's that much bigger than Keybase. We can't be more specific than that, because we're just diving in.