Why do you think that Ethereum will go up if Bitcoin splits?
Ethereum has issues on it's own. They are more complex and there are no solutions yet. Whereas Litecoin is a 6 year old Bitcoin clone with SegWit and Lightning network already running smoothly. And the chart is looking amazing, expected to reach 0.03 BTC reasonably soon.
Not to mention that Bitcoin most likely is not going to hard-fork any time soon. Since the 2MB blocks are not needed for at least one more year.
RE: What will happen to Bitcoin and market in August 2017