Wolf Eagle- Subsequent tweaks to ANCSA allowed for lifetime-only shares to be issued to afterborns. The kicker is the shareholders have to vote for their Regional Corporation to do so. Some of the Regs have, some have not. Mine has not.
The last time I could find a half credible count , it was asserted that that at least half of all afterborns have no stock.
Of major issue for me is that most of the land settled resides with the for-profit Regs .
The Regs are worried about the idea of land being able to be put into trust by tribes. Sub surface rights are with the Regs by and large. Some of the tribes want to pursue federal help with land in trust for police and tribal courts- Alaska has lagged in helping solve those issues and a couple careful studies see trust land and federal self-determination law as a way to help villages. 
Not sure myself. It is more complicated than Mr Havelock paints here. Issues as relate to  tribal sovereignty are not addressed at all.