EN has already lasted longer than what I personally expected, especially since the branch's gross mismanagement cost the JP golden boys what would have been their first overseas concert. They've already relegated EN's numbers to a footnote in the quarterly reports, alongside KR and ID; and they've announced that they're not factoring in any revenue from EN into their revenue forecasts.
My own guess is that the only reason they haven't formally closed the branch is because of outstanding business obligations with other companies, like the Niji Encounter thing, and Elira's ongoing collab with three branches of a restaurant chain in Taiwan (I'm not aware of any other pending promotions they may currently have). They'll probably close the branch as soon as those obligations are fulfilled, unless they decide to close the branch earlier because keeping the branch open that long would cost more than the cancellation fees they'd incur by cancelling those business deals. But in any case I don't expect the branch to last until the end of this year.
Elira's collab is ongoing until Sept. 15, and the Niji Encounter thing is currently scheduled to have four more songs released, on the 12th of every month until December (with Finana and Millie's duet coming out this month)