Yes Annieland is still there. They could easily move in with Kelvin congregation. But ordinary JWs would wonder why? Both are large viable congregations, capable of running their own Halls. If they are to share a hall who will make that decision? Do local JWs have any say in the matter?
Paisley and Renfrew congregations share a hall and only get about 40/60 at the meetings. That's probably a clearer case for merger if numbers fall a bit further. Clydebank and Dumbarton are not far, but both are pretty big congregations. Most Scottish congregations are pretty spread out. (Not easy to merge Oban with "neighbouring" Fort William or Ardrishaig) And the ones that share Halls (Aberdeen, Livingston and so on) are big congregations anyway.
Hang on there's no congregation in Ardrishaig? I thought there was. What happened to that?