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Neo: "I've come here to say what I want to say. After that, you can do what you want."
Deus Ex Machina: "Speak."
Neo: "The Program Smith has grown beyond your control. Soon he will spread through this city like he did with the matrix. You cannot stop him, but I can."
Deus Ex Machina: "WE DONT NEED YOU!!! WE DONT NEED ANYTHING!!!"
Neo: "Then I have made a mistake and you shall kill me now."
Deus Ex Machina: "What do you want?"
Neo: "Peace."
Deus Ex Machina: "And if you fail."
Neo: "I wont."

My theory: Was that like one machine was in charge of speaking, he flipped out, then the other machines impeached him and voted in a new speaker in like 4 seconds?!?

Questions? Comments? Concerns?

Well, I don't think they voted for a speaker...It was more or less all the machines coming together to make a shape that was familiar to Neo, so he could have something to speak to, or focus on! But I believe it was the voice of all the machines!

he lost the will to live

It was Deus ex machina speaking the entire time. He was reacting to how the machines were treated by humans, but then he sees that Neo is here to help, thus, he changes his tone.