I can't see them ditching the midweek meeting.
As BluesBrother says, it's their main meeting for 'training' the congregation in the ministry. Announcements are not a problem, they could be moved to the weekend, but there's no way they could have a talk, WT study and a training programme for ministry all in a single 1.5-2 hour meeting.
They won't drop the public talk and even if they cut the WT study to half an hour, you can't fit much into the remaining 30 minutes.
One meeting a week won't be enough to keep the PIMIs engaged - it's likely to increase the attrition rate.
Also, what about the twice-yearly CO visits? They have to fit his talks in somewhere too.
The weekend meeting is traditionally the 'public' one, while the midweek is the 'internal procedures' kind of meeting, so the org will probably still feel both are needed.
The only thing they might do is reduce the midweek meeting in length, maybe drop the book study. I think there's a lot of wasted time in that meeting anyway, with the unnecessary preview and review segments, the opening talk and filler items in the final section. Lately they've been cancelling regular items and showing the monthly GB video updates in that last part of the meeting too, and usually a few weeks after it's been released. What's with that? The thing is already online, and sometimes it's out of date by the time it's played at the meeting (like the recent video on preparing for the Memorial which was played at a meeting after the Memorial had happened! Duh.)
Reduce the whole thing to 1 hour max, and let the bros get away earlier for home in the evening. That might win some points with the R&F.