Given that we all need to be eating predominantly plant based diets if we have any chance of limiting global heating to a level which isn't catastrophic, anything that encourages people to eat vegan meals is a good thing - what makes you think it's a failure?
With the growing awareness of the dangers of ultra processed foods, it's no surprise that fake meat is going unsold. Hopefully people trying Veganuary for the first time will be replacing meat with nuts, beans, legumes and fermented soy products instead of overpriced fake crap.