some time lately, I have seen several projects making payments using ETH. I did not say that new projects will die but they might use this alternative, so my conclusion is whether this will be a new era in 2020 where all projects will make payments using ETH or other coins that are already on the market, or is it just a coincidence that they use this method, to avoid a very drastic decline in value when listing on the market?
the initial appearance of IEO was also ignored but it boomed in mid-2019.
share your opinion, any advice will be apreciate

Yes they are from time to time but it's very seldom, but it's preferable to accept a project that is paying their promoters with coins that are already in the market and not just Ethereum, one example I saw is Emirex, but I'm lucky to be in a project that pays Bitcoin in a daily basis, I hope my current campaign will last, because I'm accumulating Bitcoin and other coins for the coming halving.