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And, now, we have two bitcoins. Cash and umm, Bitcoin.I wonder what effect it has(will have) on the future of cryptocurrency?

Bitcoin Cash isn't the only altcoin. It's just a recent popular one that forked from Bitcoin's blockchain history.

Coinbase is going to support cash... as they go others will as well...

Coinbase currently has no plan to support Bitcoin Cash trading. They won't even support withdrawals until 2018.

Crawl, walk, run. Market demand will change all that.