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You can already buy Steem with Ether on Poloniex for example. It's just a matter of these pairs becoming more liquid.

When it takes many $ and hours to get your BTC transaction through to the exchange, people WILL start to choose less liquid trading pairs like STEEM/ETH. Since liquidity is a virtuous cycle and there's no comparable backlog issue, those pairs will eventually be the more liquid options.

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STEEM 0.30
TRX 0.12
JST 0.033
BTC 64344.02
ETH 3142.36
USDT 1.00
SBD 4.01