The problem is that, when he made the poll about going to MNL 2, people voted for him to finish MNL 1 first. The only thing said about MNL2 was about the "upgrades" in quality, coding and that MNL2 story begins exactly after MNL story ends.
I'm pretty sure the game is going to its final stage after 3 - 4 updates. if you count 1.7 Beth & Mss Turner (maybe one more minior character), 1.8 for Shasha & Sarah (i dont believe he's going for Amy and Laura on 1.8), 1.9 Amy & Laura. This leave only the main quest (Maria/ Jet/ Gangs) and 3 "side" characters (Like Markus, Christian and Mss Gina) for 2.0 and beyond.
I understand some people wanting the "others paths" that BON planned when he began the game, but the game is so big right now, that it would take him way to much time to make them (Like betraying Jet and giving her to Warren, or not reporting Ronald thing).
In my opinion i can see the game finishing by 2.5- 3.0.