It's not impossible, but it won't happen. Maybe there will even be a new coin or another coin that will surpass the BTC, but this coin is certainly not ETH. The economy, a structure that has already developed around the BTC, is enormous and this won't be affected so easily. There are many factors that inhibit current prices, but in 10 years if you have to bet on who will survive and still be number 1, betting on ETH is really being very brave.