If we can get a solid working Dapp on ethereum, it will slowly but surely grow and overtake bitcoin in the future. I know it will be hard for the hardcore bitcoin supporters to digest but ethereum is much better in many aspects when compared with bitcoin.
I agree with your point as we are all aware that ethreum is winning more trust of people and can replace bitcoin as the number 1 rank but there is still a long target to achieve for that and the path will be bit difficult but ethreum can easily ripple bitcoin due to its specifications.