If ETH were to surpass bitcoin in terms of its pricing then a lot people will be shock and will become a multi millionaire, nothing drastic will become to crypto world it will just continue the way it is, it will only open a new possibility that other alt coins can overcome bitcoin.

A lot of aspiring coins will emerge from that time since bitcoin has been overthrown and been replace by ETH, and bitcoin cash,ripple and other alt coin will be doubling their effort for being number since there is a chance for them to take over the scene.