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I think it has already impacted the other coins as well. Nearly all cryptocurrencies are up since the BTC futures were announced. The price surge of Bitcoin impacted the whole crypto space.
It's hard to predict what it will do with the price once the future trading goes live next week. I think a lot is priced in already.

Thanks for aharing your opinions, it means a lot! I guess you are right about the price of the cryptos being already impacted of the futures trades, even though they not started yet. Can't wait to see what is next!