They still have voice. Although MPs should represent their constituency, their views (and the views of constituents) necessarily will be influenced by argument (and party conferences and elsewhere). We are talking about electing the party leaders (and PM) here, not policies. Though, ultimately, I would leave policy up to MPs too. They are the ones who have the extra information and resources are have to make the policies work. And, because their control of Parliament is always limited (even if the have the majority of MPs), they will always need to make compromises. Or, should all Parliamentary decisions require the approval of members of the majority party? That would seem the logical conclusion (reductio ad absurdum) of your position.
Members should only influence policy and position of party MPs. They should not have direct votes on any of it.
So first you say the members should have some input but in the end you state the members should not have any input in policy or the framework of the party including it's leader, cannot see that attracting members with the attitude of you can join pay your membership fee, but go and sit over there and say nothing let us decide for you! How do members influence anything without any power to do so?
It has to said though most of you have been bleating on about it needs to be a broad church and totally inclusive, totally agree with that but when push comes to shove you want to only allow your own narrow views and to be told what to think by the political elite in the Westminster bubble (some of whom have no concept of problems faced by many in their constituencies) and others who pay lip service to it, in fact you seem to want them to tell the rest of us serfs how this party will be run.
This party will only work if it is inclusive of everyone with everyone having an equal say in the decision making about the party it's framework and future and certainly that includes the choice of the next leader
In the Beginning:
"The Labour Party originated in the late 19th century, meeting the demand for a new political party to represent the interests and needs of the urban working class, a demographic which had increased in number, and many of whom only gained suffrage with the passage of the Representation of the People Act 1884."