Adam B. Vary Senior Entertainment Writer SPOILER ALERT: This story discusses major plot developments in Season 2, Episode 6 of “Loki,” currently streaming on Disney+, and “The Marvels,” currently playing in theaters. For the past few months, I’ve been talking with some of my friends and colleagues about a radical idea that’s been bouncing around in my head that I haven’t been able to shake: The only way Marvel Studios can save the MCU is to destroy it. It’s become something of a national pastime of late to obsess over the perceived unraveling of the Marvel Cinematic Universe.