Well yeah, many games get abandoned for various reasons.The most common is probably the devs expect making good money with a couple of releases, just that this happens only extreme rarely, then there is character and branching bloat, all kind of irl problems etc.
For the falling reloaded the dev went from a lucifer style MC out of revenge, to a completely doormat and added college theme, made all the main LI's unlikeable and as that wasn't well recieved he was going on a anti pirate crusade which he spent more time on than developing his game...
The thing is, if the dev is out of ideas, or wrote himself into a corner, filler content won't change anything, it will merly prolong the time until he abandons it. Also i'm not against filler content, i like nice scenes with the LI's (the main ones), but the ratio in this arc is so screwed it's just too much for me to enjoy.
For example, the MC actually training the girls (and himself), searching for Taron (who is well hidden) and spending some quality time with the girls would have been all good in my books and it would have actually conveyed the feeling that they are preparing and actively trying to bring down Taron.