I doubt it's due to content. He's been dropping updates like clockwork, and the last 3 or 4 updates have had a ton of content. My guess is that the 1.1 update was the tipping point of an obvious problem: the game is bugged to the point that it is becoming unplayable (or at least unenjoyable). He's going to have to take a month (or two) and focus on re-coding the game. If not, he'll continue to lose support in my opinion.
There is that and from what I am seeing the fact that while the story is supposed to be branched path it is anything but that.
Not to mention certain quests as I pointed out are locked if you choose differently. For example Brenda, and Pam are locked out from you if you choose Shasha instead of sarah due to needing the beggar shop in order to complete or in Pam's case start her quest.
Then there is the fact that if for some odd reason you choose not to help Ms Taylor there goes Laura's chain due to hers being tied to it.
Oh and lets not forget the oh so wonderful not giving Sarah the third tinymon card which would 100% lock you out of Jet's quest due to her quest being linked to Sarah's.
I could go on but you get the point.