There is no way to happen that at least in near future. The gap between the bitcoin and ethereum was not so big last couple of years ago. However since last two year that gap has increased so much that it is very difficult for ethereum to reach the half way of that. Currently bitcoin is at ~1000 USD mark (9700 to 9555 USD)  range. Whereas Ethereum is at 475 USD. Interestingly widely criticized bitcoin-cash has managed to reach ~1600USD range in few weeks from 300USD mark. THough this raise has been observed from the specific countries investment. But still ethereum is finding it difficult to break that 1000 USD barrier so far.
One that is in favor of ethereum and that is the market capital it has. It is second largest market capital next to bitcoin. Other coins have less than half of its market capital. This indicates confidence of investors in it.