The Borg strategy for decades was to build, or have built by the local cong., smallish KHs which would hold about 150 or so. The KH would then be shared when it got over that by splitting into two smaller congs., and then build another KH of similar size nearby when the numbers allowed. They used to brag about keeping the size small, comparing it to the 1st Century and stating that it was so much better for the sheeple than the large mega-churches.
That strategy worked until it didn't. I would guess that the highest profile task/assignment at the Dark Tower now is a cadre of MBAs and other business experts who are laying out the corporate structure and identifying cost saving measures, which we have seen for a while now. When that met with limited utilitarian value, they appear to have addressed the other thing in their control, paying very close attention to each business unit (DO, CO, Elder, DC, RBC, Branch, Missionary, Bethelite, etc. - think of these as 'overhead' not directly associated with production) and make cuts, closures and consolidations.
When that exhausted its financial abilities to give the Borg the bottom line and cash flow desired, they did something very different - they appear to be morphing into a completely corporate structure where the production units, the KHs, are now being targeted. If they are closing, combining and consolidating in Europe, they will most certainly do so in the US. It will be interesting to see if the rank and file will be willing to leave their existing KHs, which they probably live within minutes of and for which they have shed blood, sweat and tears and provided $$ to keep afloat, and drive to new and larger KHs which combine several congs.
That, IMHO, is where they are going. So expect more mega-KHs in the future, driven by economics. The Borg's MBAs are closely evaluating changing demographics (religiosity, education, economic status, and racial/ethnic profiles) of every community to best determine the most efficient use of funds. If they technically 'own' the KHs, it makes this corporate shell game of closing, consolidating and combining much easier.
Will the rank and file be OK with their own KHs closing/combining/consolidating??? Shiny new KHs may do it for some; for some, eh - not so much. That, IMHO, is the 64 dollar question. The European example will likely become standard.