To calculate productivity, ignore 0.6 altogether. The first post on the website was on 11th Jan 2018. Counting the christmas update as well, he's released about 3500+ images and 100+ animations in a little more than 11 months. This does not take into consideration the time taken to create the assets, characters, BGs and what not. In terms of relationship points, he's completed 15 points in that time frame (Linda & Caroline 4, Sara 3, Celia and Liza 2). Given that at higher relationship lvls more story is required, he's done pretty well so far. So, if he were to continue at this pace it would be over in another year or so.
The main reason is how much this game makes him. Look at lewdlab, DoD got him nearly 5k patreons. He's had a massive fall-off after it ended. (
You must be registered to see the links
check all time graphs)
Icstor had 1500 at best before Milfy City.
Then there is the tedious work of starting all over again, from scratch. Go through the same steps of a porn story with the buildup and crap.
My main concern is that he'll not start a new game, but that he'll quit completely and do something else with his life.
Finally, he didn't get burned out just because of 14 months of working on milfy city. It was because he worked 4 years with barely any breaks. I've been following his work since Robot's touch, and he has not taken much of a break from what i remember. he might have delayed a few weeks or so, but never a proper break!