The tax attorneys will be forced to "produce" something. They will contribute to the economy!!! Their human capital will not be lost down a rat hole.
Most will simply work in financial planning - helping folks sae for the future - rather than record the past. JMHO
I work in conjunction with a large CPA firm. Tax is only one part of their practice and they aren't even doing most of the returns anymore, they send them to India. Under a NRST they would be retained by businesses collecting the tax to keep the books straight but undoubtedly that would be a less lucrative venture since it doesn't require so much interpretation and consulting. They aren't worried. They will still have auditing, forensics, financial planning, etc.