MATM was abandoned when Ero worked alone. PO has a team of devs this time around, so there is more commitment to it. Also, even though there are months between updates, then they have been consistent for at least a year or two. Yes, its not going fast, but its very time-consuming to do what they are doing and you will see people underestimating the effort it takes to make videogames all the time.
Does that mean PO wont be abandoned? Nope. But it does mean its less likely. What worries me the most is that the only progress they are having are H scenes and stages right now. The stats, moves, gameplay and all that still haven't really been touched since the game was released, making me question if they even have someone to do that.