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That's true, but Bitcoin still hasn't even begun to go up. In fact it's only at fair market value relative to it's long term trend. You watch it go up 3x overnight just like Monero did, or even more. Then it'll be interesting to watch all the alts and the ICOs on the way down...

What you are neglecting to consider is how the relative value propositions of different altcoins are going to change - many altcoins are vast improvements over Bitcoin and offer much greater utility - Bitcoin simply has the majority of investor confidence and public exposure but this will slowly change. Bitcoin will not reign forever.