Inafune maybe, but IGA was mostly revered by the rabid Metroidvania fans, is not as famous that one of the figureheads of 90's and early 00's Capcom.
It's all relative. Honestly despite the fact Inafune has done a lot more than just Megaman I think he's almost exclusively known for it. He also gets credit for the games when he was the character designer, but that's another topic.
Anyway my point is you can argue the two of them are only known by hardcore fans of their respective series. If you were to do that I would agree with you 100%. But the thing is aside from them who would be well known as far as game developers in Japan? Hideo Kojima has had his name physically printed on his games (Up until recently when they were redacted) and his games are popular so he's the obvious one. Shigeru Miyamoto is another big one. Maybe Naka, Sakaguchi and a few others?
Even if you extend it out to western devs you have like Will Wright, David Jaffe, Cliffy B Peter Molyneux and maybe a handful of others that don't come to mind. The reason for this is there generally isn't a lot that publishers have a to to gain by building up individuals and even getting credited is kind of a recent thing.
Anyway having established that for a Kickstarter to really work for a Japanese developer and be an attractive prospect they need to fit the following criteria:
1. One be well known, which as I feel I established above isn't all that common.
2. Be unhappy with their current position. This eliminates most of them to be honest. I don't see Miyamoto leaving Nintendo until he's retiring. Naka is the head of Prope so he's already set, etc.
3. It's probably more attractive to find funding through traditional methods.
Now if you've followed my train of thought through this you might have come to the point where you see the conclusion I have come to. And that's basically that people like IGA and Inafune are really good for this as the fans know them, they were kind of on the outs in general and they want to make the sort of games that aren't big titles anymore.
But anyway the reason I don't think this is going to become a massive trend is that there aren't a lot of developers in this sort of niche that it really can. Do I see it happening more as the result of this, absolutely, as a matter of fact I hope it does but looking at the big picture it's not the best option for a lot of people, and there aren't a lot of people that could really make it work either.
Anyway that's my general take on this.