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It will depend on how much support each new chain will get. If they split evenly, the difficulty will eventually drop by half, to account for reduced hash power on both chains. And if one chain get too little hash power behind it, it might die off before the difficulty will have time to adjust (it takes two weeks). It will be interesting to see how the situation develops, no question about it. However, I don’t think there will be a split in August (at least I hope there won’t be). But if Segwit 2x wins, then a hardfork should follow two months later, to increase the block size. It will be a good thing for Bitcoin and hopefully no split will occur at that point either.

Probably the fork cause a price drop as well with a difficulty drop. In this case mining could be not attractive.

Dude, you got it backwards: difficulty drops ==> mining becomes more attractive, because your payout will increase!

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