I thought for sure it would take until the end of 2018 but it looks like this summer ethereum might pass it up. With the turmoil around BTC potential splitting, it might be very soon. IMO this is healthy, we will always value bitcoin for being the one that started it all, but it's time for a more dynamic and adaptable currency to take the lead.
I really very confident that bitcoin in the next few years would increasingly popular because in an increase the Exchange rate a very large although there are currently types of coins etherium deemed to have the quality of the same as BTC but until at any time will never shift position at all.