I will share my personal view only because I have not researched the topic in detail.
About actively supporting laboratory meat production to reduce animal slaughter I would think it is like supporting laboratory morphine production to reduce opium consumption. It will not stop the habit and it will probably keep those who enjoy the substance interested in having the real version of it anyway if they can.
If it is for vegans to enjoy eating it, then out of my personal experience I can observe that I do not enjoy eating meat anymore and I have only been vegan for a year now. But I do enjoy eating well seasoned, crispy and tender, hot and sizzling food items in a sandwich with salad for example. But meat in that state is a mouthfeel of flavors and textures and is very far removed from the original raw material anyway. And it is more enjoyable when it is not meat because it is more digestible

People have a very intimate relationship with food and the trend is away from artificial substances. Laboratory meat is not only an E number ingredient, it is the major food ingredient.
My personal hunch is that this is an uphill battle but then again no one knows.