But, I think that really time matters. If Ethereum fail to deliver it as soon as possible. Other coins will be more used due to better technical solution and developers and users will not change the platform (coin) again.
There is no other project, as far as I know,
of that magnitude that is willing to create a new Proof of Stake algorithm.
Other coins such as Peercoin, which already run on PoS, doesn't have all that transactions daily. Ethereum's network is not comparable to any other project, except bitcoin which is much higher.