IT s a silly bet since there could be another coin taking the lead in that period of time. For instance Steem has a lot of potential. No transaction fees, instant transactions and a governance model much better then any other coin.
So 3 years from now Steem could have the lead and then that Mcafee guy needs to eat his bip on fakestreammedia (aka national television).
RE: Bitcoin to $500,000 within 3 years or he'll eat his what?!