There's plenty of cow-free milks in the supermarket already: they're called nutmilks (ex: soy milk, almond milk, oat milk, etc). They've been around for decades.

The main thing I'm waiting for are good vegan versions of sharp cheeses like sharp cheddar and blue cheese. A good vegan smoked gouda would be nice too.

I've yet to taste creamy vegan ice cream that's on par with the best milk-based ice cream, but at least vegan ice creams can be pretty good and getting better.