I haven't been in a kingdom hall in fifteen years, so I don't know if my speculation is worth anything, but I can't sleep tonight and I thought of some possibilities. My guess would be they are having a hard time getting and keeping enough qualified elders, so the ones they do have are struggling with the demands of being an elder while also maintaining a full time job and having a family. Think how many parts the the elders have to do each week, conducting, reading, talks, service meeting parts, etc. Maybe they are getting burned out and stepping down or leaving the religion all together, leaving fewer elders, thus making the problem worse. Young men are not reaching out as much (and why would they considering what they have to do?), current elders are aging out, they had to do something.
This may be simply a way to take some of the workload off of the elders, and make the meeting more relevant to everyone else. Video presentations will take up some of the time, sisters can give door to door demonstrations, possibly the new "our Christian life and ministry" will be beefed up so there is less for the elders to prepare, possibly a lot of question and answer parts.
Another factor is that the the TMS was a failure anyway, it's not obligatory, so some don't even join, people often forget they have a talk or get sick. And for all that, most JWs can't even do a decent presentation. They should have gotten rid of it twenty years ago and focused on making sure everyone can at least do a decent magazine presentation.
Really, they should just cut the meeting down to an hour or give it up entirely, but they can't let that happen, it's a cult and they need to keep everyone running on the theocratic hamster wheel, busy, busy, busy. I doubt all this will help much though, they are just rearranging the deck chairs on the Titanic.