Him working with Blender also means he's gonna be doing most likely even more detailed renders and animations, which take a whole lot more time. Either way, he's only gonna start with Blender with Season 2, which at the current pace, will only start being developed in 2023 if he decides that 5 chapters = 1 season. If it's 10 chapters for 1 season, then get ready to wait a whole lot more.
I foresee a point where Ocean has advanced his tools (hardware and software) and personal skills, so that he's determined the standard for his products. While someone with his motivations and personality will never stop improving his command of his creative process, at that point I'd expect he'd focus on advancing his storylines as rapidly as possible while meeting that standard, and the time between updates could shorten dramatically.
But I also expect we're a fairly long way from that. There have been a number of studies about how much time someone has to put into mastering something, and they've looked at everything from painting, to shooting, to mechanics, to software, to pretty much anything you can think of. Their conclusion was that, on average, mastery shows up around 10,000 hours of applied effort. Changing toolsets increases that average, but how much is hard to quantify. WIAB showed up here in 2018. Ocean's been climbing that learning curve before and since, and as he's learned more he's searched for and adopted better tools and spread his focus to broader areas.
His game(s) require expertise in multiple areas, and each requires its own mastery. Given his dedication to improving his game(s) and his skills, if you were to ask me my SWAG on how much longer it will be until he's comfortable with his mastery with all the aspects of game creation, I'd tell you 18-36 months from today. But that's just my opinion, and worth exactly what you've paid for it at best.
All of that said, Ocean you're already producing a game of amazing technical quality, and I know it will only get better. I look forward to the next update in either of your games. Thank you for your commitment and effort.