Trying to get out of the "whose starships kick more butt?" debate, and back to the idea of merging universes, has anybody thought of more mundane things?
I would feel sorry for the Vulcan ambassadors to the Narn Regime and the Centauri Republic. OTOH, EA would probably have more trouble with them than Enterprise's Earth does - after all, the Vulcans and Minbari ought to get along fine. I could definitely see a Narn with a bat let'h (sp?), and it would be fun to see N'Grath squabbling with Ferengi and Orions.
Just imagine the Galactica finding Earth right after the Shadow War.
The (Gil Gerard) Buck Rogers finding a strangely altered Stargate and coming out the Jumpgate to EA Earth, during his first season, while his Earth was still rebuilding.
Or Sanctuary (Logan's Run) being on the same Mars (this brings to mind a wierd question. Since links are genetically keyed, why aren't PPGs?)
If the universes merged, would Sheridan and company start wearing their links on their chests?
Would the Prime Directive be "to seek out new life and new civilisations, and boldly exploit them"?
Throw in a bit of Niven, and Jhadur would've gotten thrown into jail immediately, because she'd have nothing to sell - boosterspice works without killing. It would be fun to see Bureau 13, PsiCorps, et al, dealing with a sister-agency, the ARM. Birthright Lottery, anyone? (don't Jinx it).
Toss in Foster's Humanx, and the Gaim would have some buddies. Wonder how the Narn would get along with the AANN.
The Howard Families could have made an interesting subplot, especially because of PsiCorps, whether as an underground or as long-term sleeper agents and infiltrators of EarthGov, or even both. Wonder if EarthGov has finished building the New Frontiers. Given Artificial Persons and Living Artifacts, how much dirtier would PsiCorps' special projects have gotten?
Given Mobile Infantry powered armor, would Dodger and General Franklin have lived?
How well could R. Daneel Olivaw fit in? Dr. Susan Calvin?
Dorsai?
or maybe Clarke's Replicant Brigade, under General Roy Batty.....