In that sense it's not. However, an MLM will, by definition, at some point fail. Not true for Bitcoin
Don't pretend that BC
can't fail. Of course it can. If people don't want it, eventually it will stop trading. It might take a few years, but if the currency doesn't gain acceptance
as a currency then it will flutter away into oblivion. Right now there are people and companies that will accept BC as payment for goods/services, but BC is not the currency they use to price the good/service. Kind of like the Shekel in the Israeli real estate market, where you can use Shekel to buy a house/pay rent, but only by figuring in the conversion ratio to dollars.
I tend to think BC will be successful on some level, or if not BC then some other digital currency. But regardless of its future success, for short term investors you can only decide to buy it by imagining someone else willing to pay more than you (i.e. the greater fool), and for long term investors it is simply too ridiculous to try and guess now what value a BC will command at the point in time it becomes accepted. Hence, it's only for dreamers.