I think this is not a project problem, but a sales system problem from a project. when the IEO gives a positive response to investors, and provides better benefits from ICO, of course ICO will slowly disappear. but, currently there are still a number of potential ICO projects. if this has good results, I think ICO can still survive.
after all there are also several projects that combine both sales systems. some use the ICO and IEO sales system in stages. and I think it all becomes reasonable, because maybe that will make their sales plan get funds from investors maximally. after all, I have not heard of any successful IEOs other than those carried out in exchange with big names.