Might happen, might never happen, and by ‘overtake’ I’m guessing that you mean when one ETH is worth more than one BTC.

The two coins are taking very different paths, my best guess for BTC is that it’ll end up as a store of value, a commodity, unless the team tackle payment processing capacity and time.

ETH is a more flexible tool, a platform for business but both coins have the potential to change and develop.