> Is full time Torah learning not a productive lifestyle?
not from the point of view of taxpayers – other than classes accredited academically and qualifying for educational subsidies. Maybe, if we behave in a way that Americans see the value of learning and write it in the law and regulations, then it will be great. Say, one who gets unemployment/welfare can either be learning a profession, search for work, or learn Torah. For example, Aleph has a certified program that helps prisoners and they are teaching Torah there, leading to earlier release.
Would it be possible to qualify kollel classes as educational the way some yeshivos/seminaries do? Maybe PhD in Yevamos?