i don't think the ICO trend will come back because many investors have learned from their experiences investing in various ICOs, but they didn't get any returns and only suffered losses. also, it seems that new projects don't really like to use the term ICO in their token sales anymore, they are more comfortable calling it a pre-sale, probably to avoid the negative image of the ICO program. so for this reason i don't think the ICO trend will come back anytime soon.