This is a real thing, and internally that is what it is called. Just like the Marvel Cinematic Universe, the Marvel Theme Park Universe will tie all of Disney's Marvel (or "Super Hero" as they're called in the domestic parks) attractions/shows together. James Gunn, writer/director of the GOTG films, even used the term on Twitter when defending the new DCA ride.
The first glimpses of this interconnectivity are seen at DCA, where Iron Man puts in a video call to the Avengers Training Initiative show from the Stark Expo at Hong Kong Disneyland. He can't join us here today you see, he's busy at Hong Kong Disneyland.
There's an Avengers logo emblazoned manhole cap next the Guardians tower, hinting at the next attraction for the coming Marvel land at DCA.
What's interesting to me is that the way this is being handled so far, cloning won't work. At this point they're taking pains to point out that some characters "live" in certain parks.
Since WDW's Marvel usage is limited to GOTG and Strange (so far), I'm curious to see how this Marvel Theme Park Universe progresses, and how long they can keep this schtick up.