Out of interest, given that only 0.04% of people in countries like US, UK and Australia are vegan and even worldwide vegan populations are in between 3 - 4%, what leads you to believe the shift in the future?
The non animal rights movement towards veganism.
The numbers of people coming to the conclusion that killing purely for the enjoyment of meat is wrong in a non survival setting is growing. It is growing slowly and steadily but isn't exactly a rapid revolution.
That both the Extinction Rebellion climate awareness AND healthy living movements are finding common cause are, however, massive drivers.
I know loads of people cutting down their meat intake for these reasons, and it's made its way deep into the general consciousness. My near 90 year old parents have pretty much stripped red meat from their diets over the last decade or so, and they'll never make the mental adjustment regarding slaughter being wrong.
The younger generation more and more view the meat industry as a climate catastrophe.
Reducing meat intake for whatever reason starts to impact on the compartmentalized thinking required to separate 'these animals are pets and we love them' from 'these animals are meat and we eat them'. The desensitising starts to break down when you realise that you can easily live without killing for at least some of the time. It gives the lie to 'we need to do it'.
It's at this point that wider attitudes start to shift. Once that happens and globally we reach a point where living without meat is as easy as it is in the developed west, slaughter will start to be seen less and less as an ordinary, non problematic thing. From there on, it's just a matter of reaching the tipping point.
There's always going to be some people that want to kill for food. If the world changes, they'll kill stuff in their back yard. It will, however, at some point in the future, start to be seen as aberrant behaviour.