There are two kinds of post-credits scenes in the Marvel Cinematic Universe: the gag and the tease, and Thor: Ragnarok has both. The tease, which, obviously, teases what's coming for the MCU, is the most traditional, but gag end-credits scenes have become increasingly popular over the years (you can thank The Avengers and Guardians of the Galaxy for that). Spoilers ahead! The first Thor: Ragnarok post-credits scene is a tease, but the second Thor: Ragnarok post-credits scene is a total Grandmaster gag.
The second post-credits scene in Thor: Ragnarok features the Grandmaster tumbling out of a containment pod in the middle of the dumping yard of Sakaar. It appears the old dictator escaped from Korg-led revolution (kickstarted as a distraction allowing Thor, Hulk, and Valkyrie to leave the planet). Unfortunately for him, he emerges only to find himself surrounded by scavengers, the very same group that confronted Thor when he first crashed on Sakaar, asking him if he was a fighter or food. "I'm proud of you all. This revolution's been a huge success," the Grandmaster tells the scavengers. "It's a tie." On the surface, the scene is purely a funny little scene, an excuse to get even more of Jeff Goldblum's excellently wacky Grandmaster performance. But it also leaves the door wide open for more Grandmaster in the future.
It would be foolish to think that the Grandmaster's appearance in the second Thor: Ragnarok post-credits scene means he's destined to death. The Grandmaster is one of the Elders of the Universe, a seemingly immortal being who manipulates the energy of the Big Bang. He's one of the oldest beings in the universe, so one must seriously doubt the ability of a group of lowly scavengers to bring him down. So, assuming he survives his run in with the revolutionaries, the post-credits scene is concrete evidence that the Grandmaster might not be done messing with the Avengers.
The Grandmaster could very well appear in a MCU movie of his own. Marvel Studios President Kevin Fiege recently expressed interest in a Grandmaster-Collector movie. The Collector, as played by Benicio Del Toro and briefly seen in Thor: The Dark World and Guardians of the Galaxy, is also an Elder. In fact, he's the Grandmaster's brother. "We love the idea that they're brothers," Fiege told Fandango. The Marvel Studios head also talked about a painting of the Grandmaster and the Collector hanging in the Guardians of the Galaxy: Mission Breakout ride at Disneyland's California Adventure park, noting that it was "the only place you can see the two of them in a frame together, but let's hope that changes someday."
Fans are already hoping for a Collector-Grandmaster movie, but it seems more likely that the two will cross paths in a future MCU adventure as supporting characters. Interestingly enough, Del Toro is also already confirmed to appear in Avengers: Infinity War according to IMDB. Perhaps Goldblum will join him for a spin with the Avengers. If not, it would also make sense for one or both of them to pop up in a future Guardians of the Galaxy film, since they are both not Earth-bound creatures.
Regardless of the context, it seems highly likely that fans will get to see the Grandmaster again. For one thing, Goldblum himself seems completely on board with the idea. "I'm lucky to be in this one," Goldblum said during an appearance on the British show This Morning. "I'd love to do more, who knows." And considering the intense buzz surrounding Goldblum and his Grandmaster performance in Thor: Ragnarok, Marvel would be crazy not to want to bring him back, ifonly for a Guardians of the Galaxy Vol. 2 style cameo.
Grandmaster fans will demand more, especially after the Thor: Ragnarok post-credits scene, and Marvel should expect nothing less.