density still lower than li batteries at 300wh/kg will probably never overtake li ion batteries. But sodium is much more widely available than lithium, and it doesn't need cobalt.
Best mainstream cells cars are made with today are all around 200wh/kg.
240wh/kg NCM cells are there, more or less widely available, but they are almost the same stuff with higher rating, and lower cycle life. Manufacturers basically nudging digits.
If they reach same 200wh/kg, along with equal cycle life to LFP, it can be big.