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. so for this reason i don't think the ICO trend will come back anytime soon.
ICO's are still there actually but I think their numbers are now smaller than before because they are also aware that many people don't like ICO's anymore. Not all are losing in investing in an ICO but there are also investors who are happy about it because they earned a really huge profit out of them and maybe the OP is one of those investors, this is why he is asking if they will have a comeback or not.
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
ICO has its own meaning and maybe the reason why they don't use such a term is because they have a different way to sell their coins. There are also pre-sale in an ICO and even on other fields outside cryptos. It was only a term used for selling a product early and those who will buy will have a certain discount.