I could still see them shutting things down in Mill Hill, even if they are buying new properties there.
One thing to explain that would be if they are wanting to sell the Bethel flats out at Finchley - that would instantly displace a large number of Bethelites, though they will likely be glad to see those flats go, and Bethel will be glad to be rid of the flats as well, and be rid of a source of many London Bethel problems. Buying properties closer to home in Mill Hill will act as a bit of a "buffer" if they sell the flats, and property around Mill Hill is still probably a good investment anyway regardless.