Separate but equal, huh? Hardly seems like a long term solution.
Giving the elves a place where they won't be killed en mass in purges, where they aren't at a perpetual disadvantage to humans, where they can have religious freedom to follow the Creators, and where they can be their own masters, sounds like a fairly good solution to me. Certainly better than siding with either Celene or Gaspard for whatever crumbs they might throw to the elves.
I'm sure Sera might have some strong thoughts on the matter of an independent kingdom of the Dales (if such an outcome is even a possibility), especially if the survey is still accurate about her culture being the underbelly of the city, rather than elven. I'm uncertain as to how this conversation might be colored if the Inquisitor is Dalish.
Last time I checked all ethnicities in America were equal and we haven't merged into one conglomerate ethnicity yet, so..... Just because Elves are equal doesn't they'd suddenly run out and marry a bunch of silly shems. People tend to marry people of the same ethnicity, by an overwhelming majority. Plus it is entirely possible that half-elf and elf pairings would produce elves, so far we only know that elf-human produces human, several generations down is unknown at the moment.
The developers have said that the pairings of humans and elves produce human children, and indicated it's likely caused by something magical (that they haven't elaborated on at the present time). This is also mentioned in "The Calling" and "The Masked Empire". We also see the grown children of humans and elves, and they are human; some even speculate Alistair may be the grown son of Fiona because of this fact. Merrill even eludes to this if she's in a romance with a human male Hawke, since their children would technically be human. Given the magical implication involved, I see no reason to compare the unions of elves and humans with real life couples who may not share the same ethnicity.
My Surana Warden romanced Morrigan, and my apostate Hawke romanced Merrill, and any children they have will technically be human (including the OGB, I'd presume).