I would like for the ability to at least explore sexual experiences (not necessarily pure penetrative intercourse) with more than just one single person at a time, but I don't believe that's what Bioware and their fans truly want.
I think "pure" polyamory in the sense of really just being open to anyone at any time is a bit tough for a lot of people, even people who consider themselves very progressive, to swallow.
The notion that all we ever have to do in life is be good enough for one person, or maybe just at one point in our life, is a powerful fantasy that propels much of the modern world.... truly rejecting that as seismic implications for thought and a burgeoning global society, on every conceivable level, science, religion, economy, etc... so... that's a different ball of wax then just a mere logical extension of the "progressive" sphere that increasingly incorporates LGBT etc etc.
Although to be fair, a failure to incorporate that notion has led to substantial chaos at any rate... not that I believe this is willful, however.
However, I've seen a lot of variation. For example, most people who actually identify as polyamorous that I've encountered also tend to still be at least attached to like a "primary" or a "secondary," with respect to people, or they have rules and limitations regarding what they will undertake with others, such as sex with so and so, or they permit exhibition in X category or Y instance, kind of thing. It's sort of like "modified polyamory." This causes them to feel better because they still have the "one relationship" and a kind of conservative basis while nonetheless not feeling totally constrained and limited by it.
A super common thing that I've seen is people will have a primary heterosexual partner, but be more unlimited with respect to possible same-sex partners. So like a guy will let his GF see other girls but not other guys, sort of thing. Likewise a female will permit a male to see other men, but may reserve for themselves different experiences, etc.
Anyway, while I would doubt Bioware's ability to create a kind of pure instance of oh hey we just met and I just saw someone else but this is fine! Sort of thing, I could see them potentially exploring that gray sphere in the middle.