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Ethereum has much less historical data to create a channel from but is looking more bullish than ever. Based off historical data, it should reach the $10k mark as early as December 2018 or as late as August 2020.
$500k per BTC at this time seems unattainable by most sane persons. This is a long term view showing the exponential growth BTC has seen over its lifetime and based on this past performance how long it will take until we reach $500k.