The next Trek series needs more aliens, especially in the background. Going through DS9 again, I can't help but love seeing all the old alien species pop up on the Promenade (Pakled, Benzite, Bolian, etc) as well as many new ones who aren't identified. Starfleet isn't homosapiens only!
So long as a character isn't just a "token" (they are well developed, written and acted) then I don't really care where they came from.
Commander Austin Harris, First Officer, Deep Space Nine (by FltCpt. Bossco)
8.01 - Darkest Before Dawn
(Chapter 8 added, 12/09/2015)