People will have other assets like gold, shares or simply have some money in a saving account in the bank to have peace in mind
People who have money always have to diversify.
Gold, properties, companies, even shares are good options.
Money in the banks can be treacherous (never forget Cyprus, March 2013). So the idea OP tries to propagate is not very bad.
But I see at least 2 weaknesses in OP strategy:
* Millionaires of the world don't really stay on bitcointalk.org (though with some luck one of their advisers can be around)
* If they buy all the available Bitcoin, there will not be enough for us, the "mortals" to accumulate more and ... get to follow our dreams