I haven't read this whole thread, but I thought the subject of transitioning and lesbianism came up, if I recall (and if it wasn't another thread), and I can't help but feel if such questions are actually ones about convenience, like asking....
"Why transition from male to female if your chances will be worse with your preferred gender (women) you date upon transitioning? Should you prefer women."
And I actually have some personal experience on the matter, and would say that the chances aren't really worse. A lot of women are bi whether they are outward about it at all or not, and a lot of women feel a bit more comfortable (at times) around other women or even just non-masculine personalities in general, sharing things with them they probably wouldn't normally share with cis men - even in cases when they are interested in that other woman or non-masculine personality romantically.
Then add to that that when it comes to things like online dating, the dating pool is saturated with men, and has fewer women. And I'd say that, in this day and age, things run the potential to be about equal when it comes to finding a partner.