I mean, most people will probably look at the actual content and not at the number of updates. I'd totally agree that he should have split the main story into 3 or even 4 updates, given that each update helps a lot in terms of popularity, free advertisements, etc., but it's not like that's going to influence the amount of total content.
Else I'm not sure why one would assume that those who aren't happy with what DC is doing would actually continue to pay. I for example didn't like what happened in the last months and canceled my, anyway just symbolic, pledge for now. I'll play the next update, see how the Ronda stuff is going and possibly repledge after that, if it's as good as one would expect it to be. It takes a few clicks and 5 seconds.
If people care so little about their money that they can't make these very minor adjustments, it's indeed mainly their fault.
Well, the team is at the current size for years now and there's no indication that it would grow. So it's not like DC is asking for more money to hire more people.
I personally don't think it's on patrons to force DC into growing his team to a level he isn't comfortable with. Those who think they don't get enough for their money should just stop pledging and play for free until they feel it's worth some money again. DC, unlike most other devs, totally gives you that option.