That’s sad. Less competition, worse both for those watching and making content.
Makers of (gaming-related) content for YouTube – worried about the future of YouTube – have often already been relying on Twitch to provide them some stability, to stand on more than one leg. This competition also insured that YouTube couldn’t do literally anything. Makers of content had a place to go if things didn’t work out.
This is a potentially great move for Google and more specifically YouTube, but I don’t see any upside for anyone else (ignoring those profiting from the sale for the moment).