as we see now many project are using IEO system to collect funds from investors and I feel IEO is very popular at the moment, besides that I also see a lot of IEO that are currently successful, therefore I am sure that the price of ETH will definitely increase too if many project use blockchain from Ethereum (ERC-20). because as we know in 2017, where ETH prices increase very high due to ICO very popular and successful, so if this year IEO will experience the same thing as ICO in 2017 (popular and successful) then it will make ETH prices increase again (bull run).
in my opinion there is no influence between IEO success and the price of Ethereum will increase very high, so you can't expect that the success and popularity of IEO will affect the price of Ethereum to increase, then in 2017 the price of Ethereum increases not because many ICO are successful, but in my opinion in 2017 was the year when all cryptocurrency prices increase, because not only Ethereum price increase but all cryptocurrency prices also increased, therefore I believe the price of Ethereum cannot be influenced by IEO.