I could see this happening. I think the reasoning could be that the foreign language congregations are a drain on the majority language congregations. In London, from my own observation, I would say a majority of young pioneers move from their home congos to foreign language congs. This allows the young bros & sis to gain a measure of spiritual autonomy which is desirable especially if your father is an Elduh. The foreign lang congs can sometimes get a reputation of being a law unto themselves... some of the Spanish lang congs (in London) are considered good for social stuff.
So the English lang cong lose many of their pioneers meaning their own FS arrangements are not as well supported. The foreign language congs also take up time slots for Sunday meetings, slots for midweek meetings and, listening to accounts servant gossip, do not pull their own weight financially.
It would make sense from the societies viewpoint to re-integrate the foreign language congregations. The English lang congs would get a boost of pioneers and elduhs, more slots for meeting times are opened up, the English language ministry gets a boost and maveric congregations are disbanded.