judge has approved a plan to resolve concussion lawsuits brought by more than 5,000 .
the nfl expects 6,000 of nearly 20,000 retired players to suffer from alzheimer 's disease or moderate dementia someday .
the settlement approved on wednesday by a federal judge in philadelphia would pay them about $ 190,000 on average .
senior us district judge anita brody approved the deal on wednesday after twice sending it back to lawyers over concerns the fund might run out .