Kids are tuning in anyway.
The overall point of your post is well-taken, but I do want to say that we don't actually
know this yet. We don't have demographics for Go-Busters's ratings yet, so it's not clear if the poor ratings are due to a low Kids average or low averages with other groups.
That's a bit less icky than "Masato knocked up Yoko's mother and was never in his daughter's life"
So, obviously, this is something shocking to a Western sensibility (a superhero who's a deadbeat dad?!), but I don't think the target audience would consider it icky. There's a lot of classical Japanese folklore, the sort kids would already be familiar with, that revolves around awesome adventuresome parents having awesome adventuresome illegitimate children.
A lot of actual illustrious figures from Japanese history and culture are illegitimate children, too. Some examples include Otagaki Rengetsu, the great poet, calligrapher, and ceramic artist; the eighth unit captain of the Shinsengumi, Todo Heisuke; and Shimazu Tadahisa, founder of the Shimazu samurai clan and illegitimate son of Minamoto Yoritomo.
In short, I don't think this development would even be taken as all that melodramatic by the target audience. Family drama like this is usually the core of classical Japanese storytelling. It would be considered tragic that Masato couldn't make his identity obvious to Yoko, but it's fairly unlikely he would be considered a bad person over it.
Wasn't Metalder cancelled though because it wasn't pulling in kids ratings? :sly:
There's no demographic numbers available for Metalder, but it is absolutely true that Metalder has the lowest overall ratings average of the Metal Hero franchise. I'm not sure the show was canceled, though? I always heard it was just planned to be a shorter show, for the same reason Decade was, so Toei could alter what time of year new Metal Heroes launched.
ratings this week - 3.1
a bit better than the disaster last week but still too low
the average keeps plummeting towards the 3.* range.
A sobering thought: we probably haven't seen Go-Busters's lowest rating yet. Check out
this chart. It becomes very obvious over time that most Sentai have their lowest overall ratings at episode 25. (I don't know why this is, and would be interested in hearing from anyone who did.) Given the precedent set by episode 22, we could easily see Go-Busters dip below a 2% when it hits episode 25. Those are danger zone ratings for Sentai.