You shouldn't see it as a threat from the price perspective because It means nothing, you should however see how much Its mentioned on the news, how many shops (local and online) use it, how many ATMs does it have, how active the development is etc. Bitcoin wins in all these things beside Ethereum is not meant to be an electronic cash but bitcoin is.
It is not acualty a competition or rivalry between ethereum and Bitcoin it is much more on a relationship which both variable have a good thing brought by one currency to another. It is especially a mutual relationship which both help each other on the market for their price to reach its full capacity for development. Each has a price that is quite needed on trading where in peole choose to used them as a. Form of transaction.