Basically we are talking the same issue but we are looking it from different angles. First of all what I mean with Talent (Kipaji) An exceptional natural ability to do something. (e.g. we can all learn to play football, probably through hard work I can even become as good as Peter Crouch or Jermaine Defoe....., But am sure no matter how hard I try I can never be has good as Messi... Because the boy has got Talent).
Now in business there are people who have vision, they see problems they turn it into solutions, like they might see scarcity of water and they build a well and start selling water; or they might plant trees in order to sell it after few years to come. Now our main argument is you dont have to have natural ability or exceptional skills to become rich. Anyone and I mean anyone with the right attitude can change their living ways and boost up their income, ofcourse we dont have to listen to a word from Kiyosaki to become rich, but so long as what Kiyosaki is saying is true and he is not advocating getting rich quick schemes, making money from what he is saying does not make what he is saying to be false.
Now in America of course you can not become rich easily..... Its very hard bacause the country has matured as a Capitalist Country, Competition is Stiff, Most Business are saturated and there are big guns... Big supermarkets (walmart etc) so in this case people can use other means like buying shares and playing the stock market, or use their creativity to come with something new or find some niche market (in simple terms in America is like in every field there are Tigos, Vodacom, and Celtels).
Now in Tanzania there is no excuse because competition is not stiff yet; even if you can not get money there are means of raising funds like through your relatives, friends and saccos.
Also about your point Asians and Arabs were successfully because they new where to get products, there is some truth in that but even in those times all of us did not need to sell exotic things, we could even have sold natural things like crops e.t.c just buying from point A and sell to point B, Buying Wholesale and selling retail.
The bottom line getting and staying rich is a way of life.... Its how we treat and value money... and since most of us have got bad habits when it comes to money, and its very hard to change ones habits, thats why most of us can not make it.