Lab grown meat (and milk, for that matter; there’s some work on that) should taste much like real meat. Milk substitutes don’t really taste like real milk.
It’s also likely that at some point animal agriculture subsidy will end, and cost of externalities may be tacked on. At that point price will influence consumer behaviour. Plant ‘milks’ are currently more expensive than actual milk largely because farmers don’t have to pay for emissions, largely don’t have to pay for water, and are quite heavily subsidised in other ways; this can’t continue indefinitely.
It’s also likely that at some point animal agriculture subsidy will end, and cost of externalities may be tacked on. At that point price will influence consumer behaviour. Plant ‘milks’ are currently more expensive than actual milk largely because farmers don’t have to pay for emissions, largely don’t have to pay for water, and are quite heavily subsidised in other ways; this can’t continue indefinitely.