I was born in back in the 1970s and was in until about 2010. During that time I would often hear about areas needing new Kingdom Halls due to growth. That is why there was a whole contribution box in every Kingdom Hall just for that purpose.
Now, the excuse is being given that it is too expensive to do this. So congregations who's numbers are dwindling are being consolidated into one congregation at one Kingdom Hall. The unused Kingdom Halls are being sold and allegedly the proceeds go to build Kingdom Halls where the increase in number requires more meeting space.
Here's the problem with this new model - its a never ending cycling. Who is to say a few years from now the area that was consolidated doesn't experience growth and now needs another Kingdom Hall? Who is to say during that same time the area that needed a new Kingdom Hall doesn't experience a decrease and now they can be consolidated into one Kingdom Hall?
If the rising cost of building and operating Kingdom Halls is such an issue why not just stop having them all together? Wouldn't it make more fiscal sense to just rent/lease a space to hold meetings? They do it for Memorials every year. They last few years I was in I remember going to a hotel ballroom or a community center for the Memorial than attending at a Kingdom Hall. If it is alright to celebrate the Lord's Evening Meal at the local Holiday Inn why not have the public talk there too?
Why not buy double wide trailer homes and just park them wherever they need them? If the congregations shrink, consolidate them and then move one of the trailers to where the congregations have grown.
I could go on and on with models that work better than what the Watchtower is currently doing. However, I think that is just evidence to the fact that it is not about the congregations - its about the money.