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I think ETH will still rise in 2018, at least until there is first Dapp on EOS.

I heard that apps built on ethereum could potentially be switched onto EOS without much re-write. Do you think that's true?

I believe it will be possible, since EOS uses Web Assembly language, which is able to compile languages such as: C, C++. They should soon be adding support to otherlanguage s as well, so be on the lookout for such news.