That 80% is a number that gets quoted often but if you look at the original source they count every single ICO that failed to reach its soft cap and returned investors money as a scam and every ICO project that never got to the point of raising any money. The fact you include 99% as a scam shows you have not a clue what you are talking about. I have done bounties for over 200 ICO's in the last year and only 20 have turned scam as far as I am concerned and I include those that reduced their bounty in that number. As far as outright scams where they ran away with the money I have only had 1 do that.
This can mean that you are good at selecting projects.
Of course the
ether will survive without ICO, but it will be just one of the altcoins. Recall such projects as
NEO,
NEM,
EOS and others, this is in some approximation an Ethereum without ICO.