In any case i think there are always solutions out there and if the team is serious and they think that the project is viable they should hand ove rthe project to some other competent team of developers with a deal where the old team can hold some percentage of tokens while new can have double the percentage of tokens to revive the project.
Compeltely abandoning the project is really annoying rather pathetic because the supporters and investors are the ones that suffer and this also gives bad name to icos, new projects and crypto in general which is not the right thing to do.