I agree that blind loyalty will not achieve anything. But neither will discussing or moaning. The only thing that will change the leadership is a leadership election and that is not likely to happen until after the next general election.

The other option I mentioned is literally splitting the party. You say it is already split. It isn't. Although there are factions it is still one Labour party. The only way to get a leftist leader before the next GE is to start a new party of the left. Which will result in a truly split Labour party and ensure the Tories tenure forever.