I'm all for it, though I understand if the effort required might make it a low priority for now. I agree it's likely only a matter of time before a female player at least makes the affiliated minors, and I wouldn't be at all surprised to see some sort of women's professional baseball league form in the near future. But given the trend towards OOTP getting more comprehensive in terms of leagues included (which is great in my books), female players could become relevant to OOTP well before either of those events happen...
The 2016 Sonoma Stompers had three female players and both Kelsie Whitmore and Stacy Piagno will be back for this season. The Pacific Association is pretty small (four teams, all clustered around the Bay Area), but the Stompers have gained enough notoriety from
The Only Rule Is It Has To Work that the Pacific Association could certainly be worth adding for OOTP 19. Similarly, if historical independent leagues get added, a team that Eri Yoshida or Ila Borders played for is likely to get included sooner or later. Finally, expanding coverage of the Negro Leagues further into the post-integration era would bring Toni Stone, Mamie Johnson and Connie Morgan into the equation.
And of course there's the AAGPBL...yes, I know their rules were different, but I'm of the school of thought that given OOTP already covers both international leagues with different rules from MLB and historical eras with different rules from today, let's not split hairs. They are definitely a well-known part of the history of the game and I'm sure there is plenty of interest. Personally, my level of interest in playing the AAGPBL in a historical game would be at least close to the pre-integration Negro Leagues or historical *** (if that becomes an option), and I'd honestly be more interested in playing the AAGPBL than most of the historical affiliated minors other than the Pacific Coast League, the International League or the Northwest League and its predecessors.
Finally, I'm sure there must be other players who would also like to have the option of creating a women's or co-ed fictional league (possibly allowing for some degree of customization of just
how integrated a co-ed league is, rather than just a three-way all-male/co-ed/all-female choice).