Just wait until Vega comes out 
How will that change anything?
It will cost as much as an Nvidia 1080 and probably only slightly faster than the current 390/480, which nobody will buy unless ZEC/ETH skyrocket in value sometime in the next few months.
You make it seem like VEGA = Some ETHEREUM ASIC, which is the only thing which would destroy ETH.
If the VEGA was very cheap or free, then yes "IT WOULD DESTROY ETH".
The extra wide memory bandwith does not make much difference, the R9 Fury or Nano is example. So I do not have much hope.