Never assume the courts are going to side with the workers. Not to be overly cynical but legal processes take lots of time and money even in the best cases, which corporations are going to have more of ten times out of ten. And that's assuming the rulings will be fair.

Having this option isn't bad, but the best, most consistent way to actually win victories is with strong, worker-led union campaigns with strong demands and escalating tactics that engage the workers and don't back down in the face of union busting.