Well at Conference in September the new rules regarding selection thresholds for Leadership candidates will be debated and likely passed (which, oversimplifying somewhat, mean that Leadership candidates can draw their support from CLP/Union nominations so long as they get 5% of PLP backing) meaning an easier route for the left of the party as currently constituted onto the ballot.
Also the Membership remains overwhelmingly (but not unconditionally) tilted in Corbynâs favour and this has doubtless increased with all the Saving Labour or whatever morons leaving the party. Only way to counter this would be entryism on a grand scale from the right and the centre, which is perishingly unlikely.