If they screw up you have Ethereum becoming number 1. I am expecting everything will go fine. There is a lot of market speculation surround 1 Aug. But if the result is positive we just go up again towards a higher market cap in 2018.
If something goes wrong then ETH could become number one but if things dont have a way to go back to normal then I think Litecoin will eventually become number one, since it is basically bitcoin with segwit already activated and none of the drama at least at the moment.