User blog comment:Godzillavkk/Star Craft 3 story ideas./@comment-31277203-20181223002720

Glad to see you're back, Gozillavkk. The UED's return would be a good idea, though I'm unsure what kind of a force they'd bring. Remember, when the swarm wrecked the expeditionary fleet at the end of BW, the UED on Earth never found out their fate. For all we know, their next fleet might not be as powerful as you think.

For the next psionic child, I wouldn't really do that for Valerian. We don't need more OPed terran psionics like that. If you must dive into powerful psionics it'd be easier just to have the protoss investigate why Kerrigan got the point she did (the protoss people had been uplifted by Amon for millennia, you can't expect some terran from nowhere to go beyond that in just a few years).

Having more Xel'naga relics found is a good idea, and I believe this is where you can have the protoss come together against the terrans. If you had paid attention to the Blizzard skins that have been released (those are canon too), it clearly stated that the Dominion were trying to use protoss and xel'naga tech to improve their own military. Alarak can easily point out to Artanis that this proves the terrans are too power hungry to be trusted.