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A couple of things:

1. Hasbro is a US-based company, therefore they plan around the US market. Adult collectors in other countries wouldn't really affect anything in that regard. Now as far as its regional divisions in other countries (like Hasbro Canada), they plan around their own markets, but are always dependent on the main branch in the US.

2. The big difference between the US and Japanese markets is that there are very few children who buy and play with toys in Japan - they have video games and mobile devices. Japanese toy makers tend to cater to, and make toys for, adult collectors because that's their primary market now. They don't expect parents to buy an SH Figuarts or Play Arts Kai figure for their five-year-old.

That's simply not the case with the US market, no matter how much people like to think otherwise. I am a parent of two small children. I know several other people who are parents of small children. Trust me when I say they play with toys just as much if not more than video games. I have a room full of my kids' toys (most of which I would have never bought for myself). My parental friends have rooms full of their kids' toys. Most of them are not collectors by any stretch.

Now there's definitely a switch point I have noticed that appears when kids reach a certain age range. At that point, they either continue buying toys and become collectors like us, or they drop it in lieu of other interests. Some might flip flop or return to toys later on, but during that pre-teen thru high school time frame, it looks to be one or the other.

3. Part of this misconception (IMHO) of adult collectors being a larger market than it is, is those of us who frequent these boards tend to interact more with other fans and collectors and not so much people outside of the hobby (when it comes to toy buying or shopping).

Bottom line, as stated by Hasbro on numerous occasions and conventions, is that they have a specific age range that they target when designing a toy line (IIRC something like 5 or 6 to 12-year-olds). TPTB at Hasbro have said that they know adult collectors are out there and they try to do things for that market when they can work it into the plan, but ultimately they're aiming for that kids' group.

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TL;DR
Nobody knows for certain, because Hasbro doesn't release sales figures for individual lines or toys and retailers don't keep track of who's buying what, why they're buying it AND for whom. Loyalty programs kind of do the first one, but not the other two (which is the crux of this discussion).