there are probably 10-15 QBs drafted every year and maybe 1 or 2 become starters. It's probably the biggest crap shoot in the draft.
Most of Urban's QBs were undersized running QBs that were acceptable passers in college. Haskins was probably the first "throw first" QB's that Urban had. He was very immature (still is) and really never developed given he only got 14 starts in college. He clearly isn't ready for the NFL. Unless he pulls his head out of his ass, his NFL career is over. If I were a betting man, I would bet he gets signed by another team, makes a half hearted effort, and gets released. Then another team will try, and fail.