This sentiment comes from:
1- Common sense. I guess that they know that if DF fails WoW is done for good. So they might want to support it at least at Legion levels.
2- Competition. Many good games out there, MMOs or not, if they want people playing WoW they have to improve how they support it. Its embarrasing how bad their content cadence is when compared with FFXIV. And most important, an MMO about LoL is coming and I bet that they are pretty scared because Riot is playing its cards very well.
3- Proletariat acquisition to support WoW exclusively.
4- Ion statements:
"We are looking into smaller, more frequent patches in Dragonflight".
"We’ve been working with Proletariat for a couple of months even though the acquisition was just finalized really recently. This is an investment in trying to give our players what they want and deserve: more content, fewer gaps in between, while maintaining a high level of quality and also making sure that we’re able to attend to the health of our team and give people breaks and downtime.
And so it’s really exciting to have all the folks from Proletariat coming on board, including a lot of real MMO veterans, folks who worked on games that predated World of Warcraft, in some cases, I was playing 20 years ago. It’s super exciting to have this infusion of talent and really there’s a lot of integration to do. Adding 100 people and merging studios and all of that is not something that happens without friction or happens overnight, but it’s been great so far. They are awesome humans and we all couldn’t be more excited to have them with us, and can’t be more excited what that’s going to mean for players of WoW in the future."
5- Mike Ybarra stating: "Proletariat is a perfect fit to help Blizzard in its mission to deliver high-quality content to our players on a more consistent basis."
6- WoW Executive Producer John Hight stating: "As you probably are aware, folks in World of Warcraft have a voracious appetite for content, and what we've seen over the last year is that we need to increase the amount of content that we can create, and the frequency with which we' re putting it in the hands of our players. That's one of the things that made this decision easy for us to start working with Proletariat, as they have a large remote work force."
I know that all the statements above do not necessarily mean anything, but giving WoW's current situation I am hopeful.