The problem with Patreon is that incentivize endless developments. If DPC is making a good amount of money every month, there is no need to rush the development, not to say to finish the game. It´s the opposite of profesional game studios, that only make real money once they release the finished game. So... Where is the problem, for DPC, in being developing the game until his death or, at least, retirement?
The only thing that can stop him continue making this game forever, is boredom. Writers get bored if they have to write always the same story. That´s the reason most of TV shows lose freshness after the third season or so and the reason big game studios drop or restart from scratch successful franchises, like Mass Effect or The Witcher: the writers run out of ideas, and new writers that weren´t there from the beginning have different visions to the ones of the original writers, and the story and characters losses quality and coherence because of that. In this case, it´s a one-man-show. I suppose DPC won´t be able to maintain BaDIK for years and years like a soap-opera.
About an episode every three months, that´s we all are praying for

But again: why the guy would invest in creating a team to develop faster this game (more expenses, more risk) if he´s doing decent money right now? It depends of his vision. Maybe he´s a business man that has the vision of creating a indie studio, create jobs and make really big money. Maybe he just wants a decent income every month without assuming risks, and that´s all. So far, I think is the second case, but maybe now he´s selling the game in GOG too, the guy is thinking in expanding his business. Probably only DPC knows.
Maybe if patrons complain in Patreon about the long waiting between releases, DPC feels the pressure and reacts, but I don´t know if that´s happening.