If you are making this prediction based on the recent boom in ETH price and dump in bitcoin price than you are getting it wrong. ETH and BTC are completely different thing and both have their own benefits, both can co-exist and might share marketcap that's all. Bitcoin will always be considered as store of value while ETH will be platform for dapps (decentralized applications).
I agree with everything you said, and just because bitcoins price right now is dumping doesn't really mean it is ending like yahoo in the future. In fact, we can not really foretell what is ahead of us.