Sure, eventually. But I could easily see it being cheaper and more efficient to grow a cow than to perform no-animal-input cell cultures for a long, long time to come, even once it becomes possible as a lab stunt.
The efficiency argument for this particular strain of labmeat wasn't 'no cows', it was 'many fewer cows' - you still have some cows to produce the precursors, but there is the potential to produce much more than one cow's worth of meat from one cow's worth of labmeat precursors...
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