Coldplay and that are big and all, but I can't see a project of any band members other than the singer being successful in the future, just because they were in Coldplay.
Look at Velvet Revolver - fastest or biggest selling debut in Soundscan history or something, just because it was former members of Guns N Roses. Guns N Roses Greatest Hits going number 1 in how many countries? They haven't put out anything apart from 1 cover and 1 original (FUCKING AWESOME) song since 93!