They'll open MS and eventually elder to women.
Officially appointed MS, probably not, but do all the duties of an MS, but without any recognition.
Yes, the Org would probably argue that 1 Tim 3 makes it pretty clear that both elders and MS should be male: "a husband of one wife", etc.
But as Blondie says, congregations have made use of women before whenever there were insufficient suitable men around, and a lot of congs today have already got sisters doing microphones and working the sound desk, etc, due to the shortage of males stepping up.
They could always create a new internal role of "female MS" (Ministering Sister? Sister Servant?), rather like they did with "pioneer" - which is basically a made-up role with no actual scriptural basis too - and they could use examples like Dorcas and Lydia and Phoebe who were known to actively help in their congregations.
Presumably, it would be inferior to the MS role in terms of hierarchy as they would claim elder and MS are specifically defined in the Bible and are of course given to men - but the only way I can see them getting around the lack of available males in the longer term is to formalise an administrative role for women equivalent to that of MS. They could give sisters all the off-platform tasks of an MS (literature, accounts, microphones, etc) and just keep the on-platform talks for the males, since that's what they consider the key difference - teaching to the congregation.
I can think of some elder's wives who would probably love being given some fancy title and a more formal structure to their getting involved in the congregation. Some of those kind of JWs love all that, fussing around over details of how things are done.