If this were JStor's raison d'être, then the pay wall would be limited in time. Will the need to scan old articles exist in two years? In five? In ten, or twent

If this were JStor's raison d'être, then the pay wall would be limited in time. Will the need to scan old articles exist in two years? In five? In ten, or twenty? There is no sunset plan for the pay wall, so your premise is false.