Problem with conservative third parties is they are too many saying basically the same thing. The Ohio law may have an unintended good consequence. If forces the conservatives to pool their efforts into one united front. Short term law is bad, but in long run it may have a good effect. Of course the two parties may change the requirement from 3 percent to 12 percent/sarc.
The threshold in Germany is 5% to get a seat in the Bundestag. That is a statistically meaningful number.