I can't imagine a world without Leonard's Spock in it, because, Ilovehimomg, but I can totally see Officer T'Pura on deck. Dr McCoy would explode like ten times a day. *grin* Two Vulcan officers on the Enterprise. She and Spock could do twin eyebrow things when McCoy started acting irrational. They could comment stuff out loud to *each other* instead of poor Spock having to think things to himself!
And maybe I'm biased seeing as I still want to grow up to marry Spock but ohLORD she is HAWT.