Doom I think is more there there to build up to Slott's planned crossover with the First Race alluded to in Empyre. It seems like the multiple teams are there to cover more ground in terms of stuff Marvel/Ewing wants to develop for other stories/crossover such as the new Kree-Skrull Empire, whatever stuff with Quasar (seems like they are picking up crumbs from Grunewald's run of multiple Quasars) and probably the revamped Olympians.