Derszoger, abhaven, Josephs, look in Shulchan Aruch O,Ch. 156. Learning full- time is only when and if possible. There is no chiyuv, guarantee or promise that always, everybody will be able to just sit and learn forever. In Europe, everybody was in kollel? Stop with your propaganda!
Plus, no country would allow such massive exemptions (especially, after annoying the majority of the country so many times, as the Chareidim have done).