Either bitcoin itself or an IMF crypto is likely to be used for international settlements and primary reserves 5 to 10 years from now. It would be foolish to create a novel crypto, with an untested codebase and protocol, and place it in such a central role in the global economy. Therefore, I expect bitcoin to fulfill that role.
but what about other promising altcoins? VeriCoin, Monero or DarkCoin or NXT? I put my money proportionally into 9 cryptos, instead of all into BTC. What if BTC plummets to $150??
In general all of the crypto coins trade at a steady rate per BTC. In other words, when priced in fiat when BTC goes up all the other cryptos go up by the same amount.