Clearly, if you can choose to put someone that really has nothing to do with the issuance of fiat currency on the notes, you could put anyone on them, and anyone includes women.
I don't really care. I find the whole business to be slightly off-putting to begin with, and this is just a reminder that other people control all the money we use. But this is the turd you step in when you choose to honor specific individuals on your notes, rather than sticking to the eidolons. By putting specific people on the money, you are implicitly saying that everyone else was not good enough to make the cut.
Putting Tubman on the $20 just seems an awful lot like Mitt Romney showing off a token black friend at a campaign event, or thumping on one of his "binders full of women". They're not fooling anyone. We know they're still hard at work, desperately trying to sell the post-2008 "recovery" that only ever seems to show up on paper, but not in paychecks. This is a sideshow--a distraction.
Can we maybe get some money without the blatant political manipulation? Crap like this is the only reason I have any interest in Bitcoin (et al.) at all. We are all simply dying to have a currency that is immune to at least one form of all the financial bullshittery that we have traditionally been subjected to.
Who is honored by cryptocoins? Satoshi, but no one knows who he really is. Doge--a meme dog. Kanye West, in what appears to be a satire of some sort, though this may be covered by Poe's Law.