I've considered that..I don't think it will happen any time soon. EOS is new, ETH is a legend in the game. But EOS is golden. If someone told me they had 100% of their hodlings in EOS I'd just nod. I honestly think that's not a bad move. Boring move perhaps..and a little wack, but yeah, EOS could be it. Amazing name, amazing people, amazing project. I should consider buying more EOS. Could easily go 10x next couple of years.
Oh..to answer your question. I don't think EOS will flip BTC. But EOS could definitely flip with ETH in 2019-2020 or perhaps even later.
As per my post I have a bit of ETH sitting in HitBTC atm. Would you like to toss some wisdom my way?