Ethereum is the mother of platforms using blockchain and smart contracts, BTC is the mother of digital currency and means to store value. They can be two different things with similar use, not directly enemies. I believe that both are the future
Ethereum is a 3D blockchain.
Bitcoin is only 2D (value store and value transfer).
You envisage a future where value store and value transfer are done on Bitcoin and value programability is done on Ethereum?
Seems unrealistic and hacky when Ethereum does what Bitcoin does so much better.
Bitcoin is also slow, expensive, energy inefficient and not as reliable. Granted Ethereum had the benefit of being able to analyse years of Bitcoin performance data.