Considering Doom has directly taken on pretty much every huge name he can get to, it really would be a shame if we can't get him eventually. He took on the Silver Surfer and stole his power, he took on Galactus and stole his power, he took on the Beyonder and stole his power, he tried to take on Thanos, twice!, when he had the Infinity Gauntlet. He's still alive despite being trapped in hell, having his body obliterated, shot into space on a meteor, routinely attacking one of the most powerful and experienced super teams out there. He has his own country, an army of robots and Doombots with advanced AI who think they are him when not in his presence, nuclear capabilities, invented time travel and is basically just behind Reed Richards in intelligence and Dr. Strange in magic. He's even taken over the world a few times and gave it back out of boredom because it was too easy.
He's pretty much the ultimate villain. He's intelligent, persuasive, powerful, rich, influential and nearly unstoppable when he puts his mind to something. I would hate to never see him integrated in the MCU.
