What about my thread? I made it as a parody of the serious threads. 
Which is actually a good idea and a good basis for conversation. I can't tell if you failed or succeeded in your thread. Depends upon how determined you still are to troll, I guess. 
To the OP: It's a creative idea, so I will happily give you credit for that. However, I do have some issues:
1) This relies too much on romance content to unlock.
2) On that note, romance content determining races in ME:A. is a bad idea. It puts far more focus on the romance arcs then there needs to be. Remember, it's the fans that place all this importance on the romances, not so much the writers.
3) That trilogy is over, and why would anyone "in a place and time far removed from the events of Shepard" care if s/he hooked up with a turian or a quarian? That doesn't make sense.
4) Related to that, both Quarians and Turians have roughly human lifespans. So Garrus and Tali would be dead by ME:A.
5) Turians have a chemistry incompatible with humans, to the point where even sharing food would kill them and extra caution needs to be taken for intimacy. Even kissing has to be done with care. Ditto for quarians.
6) The Quarians have a low population and probably not many made it on board the ME:A ship/space station. That is, if there is Quarians in ME:A and I haven't seen signs of them yet. I could see a Quarian adopting a Quarian or Turian child and raising it with a Turian spouse, but I can't see any hybrids coming from that.
7) What about those players that didn't want to hook up with an alien, or had a forever alone Shepard, or were a gay male Shepard? They shouldn't be excluded from experiencing other races.
8) A human-only PC has been 100% confirmed.
9) Why only female? I do prefer playing FemSheps (well, women in RPGs in general if I have the choice to be honest,) but...why lock the players out of a potential choice? I also find it very odd that you mentioned Tali as one of the ways to "unlock" this content, yet that is a romance available only to straight/bi male Sheps. Well, unless you use a mod.
I'm not trying to be rude, but I can't see this happening ever.