It is worth pointing out that Bitcoin does not require an investment to use it. Merchants can price their goods in bitcoins using a real-time exchange rate to limit their exposure to changing prices.
Since transactions propagate (without confirmations) within a few seconds the merchant can accept the payment and later cash out to, say, USD/GBP/EUR via the exchange or some other mechanism (e.g. direct to a credit card). Alternatively, if part of their supply chain takes payment in bitcoins (e.g. a hosting service for their website, or a supplier of goods) then they can simply pay their overheads with them.
Disclaimer: I am currently long on bitcoins and am using them as part of my long term retirement fund.
I've invested some dollars in bitcoins. But nowhere near my life savings. I'm regarding Bitcoin as a high risk investment (it is the very first distributed electronic currency after all) and I'm investing proportional to this assessment (ie., not a lot of money).
Seems to me that investing heavily in bitcoins right now might be similar to investing in real estate. Yes, if you invested a lot of money x years ago you would be rich. If you invest money in it now, though, your odds are pretty poor.
That being said, I think Bitcoin has a lot more room for expansion in price compared to real estate. But it's possible that buying bitcoins now is a bit like buying into a stock heavily after it has boomed. The ones who bought before the boom got rich. The ones who do so after the boom, not so much.
(One wonders how that worked out for him; I'd find that answer a lot more interesting than his connection.)