I actually said that I'm aware they have fallen out of favor. Yet they still are the biggest game a game company can make. Blizzard did not have any experience doing MMOs and they succeded (then Activision buying Blizzard screwed them), Riot gaming is also doing an MMO. And there is also Ashes of Creation in the works.
Instead of saying I have no knowledge, you could try to come with your own arguments.
Even if Divinity 4 was not designed to be an MMO. If they do hace the source code, nothing prevents them from adapting it, or even if they'd have to come up with another one, they can reuse existing assets.
And as for the funding. I'm pretty sure that if they release it following the same Early Access model. They'd get financing from the community. Also I'm willing to bet they will get a lot of money from BG3
