To develop policy, which they have been very successful at. I'm not an NSC nerd checking every post, you need to get over that
To paraphrase Crocodile Dundee, that's not an answer.....
The historical need for Momentum was that Corbyn had no base when he was elected leader and faced active opposition from his own MPs. That faded a bit (but not completely) over time. If it continues, it will probably be as campaigning group. It organised and motivated a lot of young people around the country, sending them to support candidates in marginal constituencies. It might continue to push for democratisation of the party. Something Corbyn failed to do as its opposed by both the PLP and the Unions. Or it might die.
.......THAT'S an answer.
There is absolutely no reason at all why the Labour Party cannot develop policy. That a sub-group does it is exactly why people don't trust Labour. The answer from [MENTION=5001]The Merry Prankster[/MENTION] at least puts that in context. However, again it reads as a hijacking pf the Labour Party from its MPs, who, don't forget, represent their constituants. I don't care if the likes of JRG consider Kyle a "pale pink Tory", he's my MP and if there was an issue affecting a large number of people in Hove and Portslade I'd expect him to do something about it. One way he can do that is to draft policy.
There is no escaping the perception that Labour is controlled by the unions and a left wing sub-clique. I don't care much whether you think that is actually a matter of fact or not, the point is that the people of Leigh and Bishop Auckland and Sedgefield clearly do.