Ok. Without having read the whole story, here's what I think it means: Review: We know that Sam is making a lot of money off of his vegan diet and YouTube videos. Kira seems to be a workaholic and wants to team up with Sam so she can make money off of him. Aldous thinks that if Sam and Kira teamed up, it would be "a lethal weapon for mass-cultural change" and then mimics a "Stalinesque" stance. "What hope for mass consumer capitalism and thoughtless consumption?" Mass consumer capitalism = lots of people buying lots of stuff Thoughtless consumption = buying things without thinking about the consequences. "What hope for..." = There is no hope for... Aldous is comparing the vegan mass-cultural movement to Stalinism/Socialism and the non-vegans to the Capitalistic society that is already established. Therefore, if Kira and Sam team up, they will lead a major cultural change. He compares this leadership to the Socialistic mentality, or rather a cult of personality. If this new vegan "Socialist vegan cult" takes over, there is no hope for the "established Capitalistic meat-eaters." "What hope for mass consumer capitalism and thoughtless consumption?" = There will be no hope for the non-vegans. (Non-vegans will have to become vegan.) Again, I didn't read the whole story. I just skimmed it so I might be missing something. Feel free to message me if you have any questions.

Hmm, it is difficult to say what this sentence means. Perhaps if I was reading the novel, knowing the context would help me understand. Part of what makes this sentence difficult to interpret is the fact that it is written in a very conversational voice… the sentences are short and are dropping some words (like the sentence 'Carrot and stick' instead of 'They were like carrot and stick'). It makes the sentence sound very conversational, but it also makes it harder to understand the meaning because there may be important words missing. Perhaps someone else will have more luck interpreting this passage!