if you have only one plant and it turns out to be a hermie.. than yes i would keep it as there are no other plants that it can pollinate..
my suggestion is to pick as many of the pollen sacks off try to get them all, you need to do this because the plant energy is being used to make pollen sacks(seeds) and its not going towards bud growth,,so picking all of them will allow more bud growth and thc production as your plants energy will be going more towards the bud and plant developement insted of the pollen sacks..
and even if you dont pick them the plant is still smokeable.