I don't know if it's "dead" but I have known a bunch of teams that, within the past 18 months, all switched from Sketch to Figma, and I certainly don't know anyone that's switched the other direction, soooo...

That said, these were all website and mobile app design teams, and another commenter mentioned that Sketch is better for print design. Still, have to imagine that print is a shrinking part of the overall marketplace.