All of exchanges that i am using, closed their bitcoin wallet for deposit and withdrawal. Some of them want to take my BTC and give me BCC instead. This is certainty and they said on news.
BCC's value is 0.1 BTC at now.
What should i do for holding value of my BTCs in dollars?
Some of them hasn't any option for trading BTC/USD.
Should I exchange my BTC with ETH?
I think you've missed to read the update about the news. Maybe its too late to decide what you are going to do with your bitcoin now. Yes, your descision were also ok because only bitcoin would splitted now while eth are not, but another problem of you is that all transaction cannot be process easily and by now it was hard to transact your bitcoin because the news was done. All you have to do is to wait again until its formally announce the return of bitcoin.