First, I think people are exaggerating the fall of the US dollar. This is not the first time that the dollar will be in a tight situation, but it's still the top currency out there.
Even if the dollar will truly die, it will not happen overnight. It won't even happen in one year. With how bad the dollar is doing right now, it's still better to hold the dollar than a lot of other currencies.
I think the same way, most of the people its talking about USD dollar falling like a currency of a third world country, and that its not gonna happen, well not right now or in the upcoming years.
About Kiyosaki, he is a smart person and also a businesman, so he know the next and actual generations of youngs are full on crypto, so he needs to catch that train and going up with that one, so he can still selling whatever he wants to sell.
And he made a positive but cautelouse prediction about BTC.