Humans are omnivorous; we're presumably adapted for some amount of animal protein. Even if meat-eating goes out of style, once there's no moral hazard involved we'll gravitate back to it.
The only way is find out how to grow an indistinguishable piece of muscle meat (and organ) in a lab, without animal suffering. Though in an ideal world sustainable animal husbandry would be best, but would never work in our hyper-capitalistic hyper-consumeristic reality, so let's find a compromise.
In this case: meat is enjoyable, but eating it is unethical, so I will make the sacrifice not to eat it. If it becomes possible to eat meat while still being ethical, then I still won’t because it marks me as someone who is willing to make a sacrifice to be ethical.
Framing the argument strictly in terms of consumption without inspecting the conditions of production also betrays a wider perspective on how we can achieve ethical or sustainable practices. And certainly it's inimical to the reality that there needs to be reform at the institutional and corporate tier of practice with higher priority rather than castigate individual and cultural consumption.