That's already happened to some degree (Legend of Korra) in SU, I think in this case that xMendoza is just adding a couple of his own faves. I wouldn't expect that he would go hog wild here, just transcribing the existing content is a major undertaking on it's own.
Now, as for ME, damn straight I'm crossing streams, errr universes in my current (not releasing for a while) project. Mainly 'cuz I enjoy creating/re-imagining new characters in Daz Studio so much. That project won't be ready for prime time for a while yet, but you can always follow my development thread should such things interest you (link in sig).
I recently took a stab at a Jubilee nod...
I took some liberties with the costume, 'cuz it's a nod, not a carbon copy... parody blah blah...
But of course I haven't forgotten about the characters that inspired me to take a stab at doing a huge project of my own...
That's my take on Mercy taking in the sunset...
And yeah, I've moved on from Re-Imagined, for reasons. Mainly 'cuz I can't draw worth a damn and want to do my own thing instead going forward.
Anyways, yeah you go xMendoza! Nice to see you still plugging away at Rebuilt 2!